diff --git a/superset-frontend/spec/javascripts/datasource/DatasourceEditor_spec.jsx b/superset-frontend/spec/javascripts/datasource/DatasourceEditor_spec.jsx
index 0032c8d2e9..a6758fb203 100644
--- a/superset-frontend/spec/javascripts/datasource/DatasourceEditor_spec.jsx
+++ b/superset-frontend/spec/javascripts/datasource/DatasourceEditor_spec.jsx
@@ -21,11 +21,15 @@ import { shallow } from 'enzyme';
 import configureStore from 'redux-mock-store';
 import fetchMock from 'fetch-mock';
 import thunk from 'redux-thunk';
+import { Radio } from 'react-bootstrap';
 
+import Icon from 'src/components/Icon';
 import Tabs from 'src/common/components/Tabs';
 import DatasourceEditor from 'src/datasource/DatasourceEditor';
 import Field from 'src/CRUD/Field';
 import mockDatasource from 'spec/fixtures/mockDatasource';
+import * as featureFlags from 'src/featureFlags';
+import TableSelector from 'src/components/TableSelector';
 
 const props = {
   datasource: mockDatasource['7__table'],
@@ -44,6 +48,7 @@ describe('DatasourceEditor', () => {
   let wrapper;
   let el;
   let inst;
+  let isFeatureEnabledMock;
 
   beforeEach(() => {
     el = <DatasourceEditor {...props} />;
@@ -142,4 +147,65 @@ describe('DatasourceEditor', () => {
       wrapper.find(Field).find({ fieldKey: 'fetch_values_predicate' }).exists(),
     ).toBe(true);
   });
+
+  describe('enable edit Source tab', () => {
+    beforeAll(() => {
+      isFeatureEnabledMock = jest
+        .spyOn(featureFlags, 'isFeatureEnabled')
+        .mockImplementation(
+          feature => feature === 'ENABLE_DATASET_SOURCE_EDIT',
+        );
+      wrapper = shallow(el, { context: { store } }).dive();
+    });
+
+    afterAll(() => {
+      isFeatureEnabledMock.mockRestore();
+    });
+
+    it('Source Tab: edit mode', () => {
+      wrapper.setState({ activeTabKey: 0, isEditMode: true });
+      const sourceTab = wrapper.find(Tabs.TabPane).first();
+      expect(sourceTab.find(Radio).first().prop('disabled')).toBe(false);
+
+      const icon = sourceTab.find(Icon);
+      expect(icon.prop('name')).toBe('lock-unlocked');
+
+      const tableSelector = sourceTab.find(Field).shallow().find(TableSelector);
+      expect(tableSelector.length).toBe(1);
+      expect(tableSelector.prop('readOnly')).toBe(false);
+    });
+
+    it('Source Tab: readOnly mode', () => {
+      const sourceTab = wrapper.find(Tabs.TabPane).first();
+      expect(sourceTab.find(Radio).length).toBe(2);
+      expect(sourceTab.find(Radio).first().prop('disabled')).toBe(true);
+
+      const icon = sourceTab.find(Icon);
+      expect(icon.prop('name')).toBe('lock-locked');
+      icon.parent().simulate('click');
+      expect(wrapper.state('isEditMode')).toBe(true);
+
+      const tableSelector = sourceTab.find(Field).shallow().find(TableSelector);
+      expect(tableSelector.length).toBe(1);
+      expect(tableSelector.prop('readOnly')).toBe(true);
+    });
+  });
+
+  it('disable edit Source tab', () => {
+    // when edit is disabled, show readOnly controls and no padlock
+    isFeatureEnabledMock = jest
+      .spyOn(featureFlags, 'isFeatureEnabled')
+      .mockImplementation(() => true);
+    wrapper = shallow(el, { context: { store } }).dive();
+    wrapper.setState({ activeTabKey: 0 });
+
+    const sourceTab = wrapper.find(Tabs.TabPane).first();
+    expect(sourceTab.find(Radio).length).toBe(2);
+    expect(sourceTab.find(Radio).first().prop('disabled')).toBe(true);
+
+    const icon = sourceTab.find(Icon);
+    expect(icon).toHaveLength(0);
+
+    isFeatureEnabledMock.mockRestore();
+  });
 });
diff --git a/superset-frontend/src/components/DatabaseSelector.tsx b/superset-frontend/src/components/DatabaseSelector.tsx
index 52c3f7a2f3..0d565f9bc5 100644
--- a/superset-frontend/src/components/DatabaseSelector.tsx
+++ b/superset-frontend/src/components/DatabaseSelector.tsx
@@ -64,6 +64,7 @@ interface DatabaseSelectorProps {
   onDbChange?: (db: any) => void;
   onSchemaChange?: (arg0?: any) => {};
   onSchemasLoad?: (schemas: Array<object>) => void;
+  readOnly?: boolean;
   schema?: string;
   sqlLabMode?: boolean;
   onChange?: ({
@@ -87,6 +88,7 @@ export default function DatabaseSelector({
   onDbChange,
   onSchemaChange,
   onSchemasLoad,
+  readOnly = false,
   schema,
   sqlLabMode = false,
 }: DatabaseSelectorProps) {
@@ -237,7 +239,7 @@ export default function DatabaseSelector({
         mutator={dbMutator}
         placeholder={t('Select a database')}
         autoSelect
-        isDisabled={!isDatabaseSelectEnabled}
+        isDisabled={!isDatabaseSelectEnabled || readOnly}
       />,
       null,
     );
@@ -245,7 +247,7 @@ export default function DatabaseSelector({
 
   function renderSchemaSelect() {
     const value = schemaOptions.filter(({ value }) => currentSchema === value);
-    const refresh = !formMode && (
+    const refresh = !formMode && !readOnly && (
       <RefreshLabel
         onClick={() => changeDataBase({ id: dbId }, true)}
         tooltipContent={t('Force refresh schema list')}
@@ -266,6 +268,7 @@ export default function DatabaseSelector({
         isLoading={schemaLoading}
         autosize={false}
         onChange={item => changeSchema(item)}
+        isDisabled={readOnly}
       />,
       refresh,
     );
diff --git a/superset-frontend/src/components/TableSelector.tsx b/superset-frontend/src/components/TableSelector.tsx
index c5c3a52af2..395b5be834 100644
--- a/superset-frontend/src/components/TableSelector.tsx
+++ b/superset-frontend/src/components/TableSelector.tsx
@@ -97,6 +97,7 @@ interface TableSelectorProps {
   onSchemasLoad?: () => void;
   onTableChange?: (tableName: string, schema: string) => void;
   onTablesLoad?: (options: Array<any>) => {};
+  readOnly?: boolean;
   schema?: string;
   sqlLabMode?: boolean;
   tableName?: string;
@@ -116,6 +117,7 @@ const TableSelector: FunctionComponent<TableSelectorProps> = ({
   onSchemasLoad,
   onTableChange,
   onTablesLoad,
+  readOnly = false,
   schema,
   sqlLabMode = true,
   tableName,
@@ -286,28 +288,22 @@ const TableSelector: FunctionComponent<TableSelectorProps> = ({
         getTableList={fetchTables}
         handleError={handleError}
         onChange={onSelectionChange}
-        onDbChange={onDbChange}
-        onSchemaChange={onSchemaChange}
+        onDbChange={readOnly ? undefined : onDbChange}
+        onSchemaChange={readOnly ? undefined : onSchemaChange}
         onSchemasLoad={onSchemasLoad}
         schema={currentSchema}
         sqlLabMode={sqlLabMode}
-        isDatabaseSelectEnabled={isDatabaseSelectEnabled}
+        isDatabaseSelectEnabled={isDatabaseSelectEnabled && !readOnly}
+        readOnly={readOnly}
       />
     );
   }
 
   function renderTableSelect() {
-    let tableSelectPlaceholder;
-    let tableSelectDisabled = false;
-    if (database && database.allow_multi_schema_metadata_fetch) {
-      tableSelectPlaceholder = t('Type to search ...');
-    } else {
-      tableSelectPlaceholder = t('Select table ');
-      tableSelectDisabled = true;
-    }
     const options = tableOptions;
     let select = null;
     if (currentSchema && !formMode) {
+      // dataset editor
       select = (
         <Select
           name="select-table"
@@ -321,6 +317,7 @@ const TableSelector: FunctionComponent<TableSelectorProps> = ({
           value={currentTableName}
           optionRenderer={renderTableOption}
           valueRenderer={renderTableOption}
+          isDisabled={readOnly}
         />
       );
     } else if (formMode) {
@@ -339,6 +336,15 @@ const TableSelector: FunctionComponent<TableSelectorProps> = ({
         />
       );
     } else {
+      // sql lab
+      let tableSelectPlaceholder;
+      let tableSelectDisabled = false;
+      if (database && database.allow_multi_schema_metadata_fetch) {
+        tableSelectPlaceholder = t('Type to search ...');
+      } else {
+        tableSelectPlaceholder = t('Select table ');
+        tableSelectDisabled = true;
+      }
       select = (
         <AsyncSelect
           name="async-select-table"
@@ -353,7 +359,7 @@ const TableSelector: FunctionComponent<TableSelectorProps> = ({
         />
       );
     }
-    const refresh = !formMode && (
+    const refresh = !formMode && !readOnly && (
       <RefreshLabel
         onClick={() => changeSchema({ value: schema }, true)}
         tooltipContent={t('Force refresh table list')}
diff --git a/superset-frontend/src/datasource/DatasourceEditor.jsx b/superset-frontend/src/datasource/DatasourceEditor.jsx
index 553066203a..a03d2ccc1e 100644
--- a/superset-frontend/src/datasource/DatasourceEditor.jsx
+++ b/superset-frontend/src/datasource/DatasourceEditor.jsx
@@ -20,12 +20,13 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import { Alert, Badge, Col, Radio, Well } from 'react-bootstrap';
 import shortid from 'shortid';
-import { styled, SupersetClient, t } from '@superset-ui/core';
+import { styled, SupersetClient, t, supersetTheme } from '@superset-ui/core';
 
 import Tabs from 'src/common/components/Tabs';
 import Button from 'src/components/Button';
 import CertifiedIconWithTooltip from 'src/components/CertifiedIconWithTooltip';
 import DatabaseSelector from 'src/components/DatabaseSelector';
+import Icon from 'src/components/Icon';
 import Label from 'src/components/Label';
 import Loading from 'src/components/Loading';
 import TableSelector from 'src/components/TableSelector';
@@ -45,6 +46,7 @@ import Fieldset from 'src/CRUD/Fieldset';
 import Field from 'src/CRUD/Field';
 
 import withToasts from 'src/messageToasts/enhancers/withToasts';
+import { FeatureFlag, isFeatureEnabled } from 'src/featureFlags';
 
 const DatasourceContainer = styled.div`
   .change-warning {
@@ -66,6 +68,15 @@ const FlexRowContainer = styled.div`
   }
 `;
 
+const EditLockContainer = styled.div`
+  font-size: ${supersetTheme.typography.sizes.s}px;
+  display: flex;
+  align-items: center;
+  a {
+    padding: 0 10px;
+  }
+`;
+
 const checkboxGenerator = (d, onChange) => (
   <CheckboxControl value={d} onChange={onChange} />
 );
@@ -279,6 +290,7 @@ class DatasourceEditor extends React.PureComponent {
       isSqla:
         props.datasource.datasource_type === 'table' ||
         props.datasource.type === 'table',
+      isEditMode: false,
       databaseColumns: props.datasource.columns.filter(col => !col.expression),
       calculatedColumns: props.datasource.columns.filter(
         col => !!col.expression,
@@ -291,12 +303,16 @@ class DatasourceEditor extends React.PureComponent {
     };
 
     this.onChange = this.onChange.bind(this);
+    this.onChangeEditMode = this.onChangeEditMode.bind(this);
     this.onDatasourcePropChange = this.onDatasourcePropChange.bind(this);
     this.onDatasourceChange = this.onDatasourceChange.bind(this);
     this.syncMetadata = this.syncMetadata.bind(this);
     this.setColumns = this.setColumns.bind(this);
     this.validateAndChange = this.validateAndChange.bind(this);
     this.handleTabSelect = this.handleTabSelect.bind(this);
+    this.allowEditSource = !isFeatureEnabled(
+      FeatureFlag.DISABLE_DATASET_SOURCE_EDIT,
+    );
   }
 
   onChange() {
@@ -315,6 +331,10 @@ class DatasourceEditor extends React.PureComponent {
     this.props.onChange(newDatasource, this.state.errors);
   }
 
+  onChangeEditMode() {
+    this.setState(prevState => ({ isEditMode: !prevState.isEditMode }));
+  }
+
   onDatasourceChange(datasource) {
     this.setState({ datasource }, this.validateAndChange);
   }
@@ -636,6 +656,7 @@ class DatasourceEditor extends React.PureComponent {
               inline
               onChange={this.onDatasourceTypeChange.bind(this, type.key)}
               checked={this.state.datasourceType === type.key}
+              disabled={!this.state.isEditMode}
             >
               {type.label}
             </Radio>
@@ -655,13 +676,16 @@ class DatasourceEditor extends React.PureComponent {
                         dbId={datasource.database.id}
                         schema={datasource.schema}
                         onSchemaChange={schema =>
+                          this.state.isEditMode &&
                           this.onDatasourcePropChange('schema', schema)
                         }
                         onDbChange={database =>
+                          this.state.isEditMode &&
                           this.onDatasourcePropChange('database', database)
                         }
                         formMode={false}
                         handleError={this.props.addDangerToast}
+                        readOnly={!this.state.isEditMode}
                       />
                     }
                   />
@@ -675,6 +699,7 @@ class DatasourceEditor extends React.PureComponent {
                           this.onDatasourcePropChange('table_name', table);
                         }}
                         placeholder={t('dataset name')}
+                        disabled={!this.state.isEditMode}
                       />
                     }
                   />
@@ -692,6 +717,7 @@ class DatasourceEditor extends React.PureComponent {
                         offerEditInModal={false}
                         minLines={25}
                         maxLines={25}
+                        readOnly={!this.state.isEditMode}
                       />
                     }
                   />
@@ -727,16 +753,25 @@ class DatasourceEditor extends React.PureComponent {
                       schema={datasource.schema}
                       sqlLabMode={false}
                       tableName={datasource.table_name}
-                      onSchemaChange={schema =>
-                        this.onDatasourcePropChange('schema', schema)
+                      onSchemaChange={
+                        this.state.isEditMode
+                          ? schema =>
+                              this.onDatasourcePropChange('schema', schema)
+                          : undefined
                       }
-                      onDbChange={database =>
-                        this.onDatasourcePropChange('database', database)
+                      onDbChange={
+                        this.state.isEditMode
+                          ? database =>
+                              this.onDatasourcePropChange('database', database)
+                          : undefined
                       }
-                      onTableChange={table => {
-                        this.onDatasourcePropChange('table_name', table);
-                      }}
-                      isDatabaseSelectEnabled={false}
+                      onTableChange={
+                        this.state.isEditMode
+                          ? table =>
+                              this.onDatasourcePropChange('table_name', table)
+                          : undefined
+                      }
+                      readOnly={!this.state.isEditMode}
                     />
                   }
                   description={t(
@@ -749,6 +784,22 @@ class DatasourceEditor extends React.PureComponent {
             </Col>
           )}
         </Fieldset>
+        {this.allowEditSource && (
+          <EditLockContainer>
+            <a href="#" onClick={this.onChangeEditMode}>
+              <Icon
+                color={supersetTheme.colors.grayscale.base}
+                name={this.state.isEditMode ? 'lock-unlocked' : 'lock-locked'}
+              />
+            </a>
+            {!this.state.isEditMode && (
+              <div>{t('Click the lock to make changes.')}</div>
+            )}
+            {this.state.isEditMode && (
+              <div>{t('Click the lock to prevent further changes.')}</div>
+            )}
+          </EditLockContainer>
+        )}
       </div>
     );
   }
diff --git a/superset-frontend/src/featureFlags.ts b/superset-frontend/src/featureFlags.ts
index 552d235f1f..1e024a5165 100644
--- a/superset-frontend/src/featureFlags.ts
+++ b/superset-frontend/src/featureFlags.ts
@@ -30,6 +30,7 @@ export enum FeatureFlag {
   THUMBNAILS = 'THUMBNAILS',
   LISTVIEWS_DEFAULT_CARD_VIEW = 'LISTVIEWS_DEFAULT_CARD_VIEW',
   ENABLE_REACT_CRUD_VIEWS = 'ENABLE_REACT_CRUD_VIEWS',
+  DISABLE_DATASET_SOURCE_EDIT = 'DISABLE_DATASET_SOURCE_EDIT',
   DISPLAY_MARKDOWN_HTML = 'DISPLAY_MARKDOWN_HTML',
   ESCAPE_MARKDOWN_HTML = 'ESCAPE_MARKDOWN_HTML',
   VERSIONED_EXPORT = 'VERSIONED_EXPORT',
diff --git a/superset/config.py b/superset/config.py
index 867be473ca..db38df4af8 100644
--- a/superset/config.py
+++ b/superset/config.py
@@ -304,6 +304,7 @@ DEFAULT_FEATURE_FLAGS: Dict[str, bool] = {
     "ALLOW_DASHBOARD_DOMAIN_SHARDING": True,
     # Experimental feature introducing a client (browser) cache
     "CLIENT_CACHE": False,
+    "DISABLE_DATASET_SOURCE_EDIT": False,
     "ENABLE_EXPLORE_JSON_CSRF_PROTECTION": False,
     "ENABLE_TEMPLATE_PROCESSING": False,
     "KV_STORE": False,
diff --git a/superset/views/base.py b/superset/views/base.py
index a3bcafa776..143f5a55f2 100644
--- a/superset/views/base.py
+++ b/superset/views/base.py
@@ -70,6 +70,7 @@ FRONTEND_CONF_KEYS = (
     "SUPERSET_DASHBOARD_POSITION_DATA_LIMIT",
     "SUPERSET_DASHBOARD_PERIODICAL_REFRESH_LIMIT",
     "SUPERSET_DASHBOARD_PERIODICAL_REFRESH_WARNING_MESSAGE",
+    "DISABLE_DATASET_SOURCE_EDIT",
     "ENABLE_JAVASCRIPT_CONTROLS",
     "DEFAULT_SQLLAB_LIMIT",
     "SQL_MAX_ROW",