diff --git a/browser/main/Detail/TagSelect.js b/browser/main/Detail/TagSelect.js
index 6e3e7a5b..e1d11e0d 100644
--- a/browser/main/Detail/TagSelect.js
+++ b/browser/main/Detail/TagSelect.js
@@ -20,6 +20,7 @@ class TagSelect extends React.Component {
     }
 
     this.handleAddTag = this.handleAddTag.bind(this)
+    this.handleRenameTag = this.handleRenameTag.bind(this)
     this.onInputBlur = this.onInputBlur.bind(this)
     this.onInputChange = this.onInputChange.bind(this)
     this.onInputKeyDown = this.onInputKeyDown.bind(this)
@@ -88,6 +89,7 @@ class TagSelect extends React.Component {
     this.buildSuggestions()
 
     ee.on('editor:add-tag', this.handleAddTag)
+    ee.on('sidebar:rename-tag', this.handleRenameTag)
   }
 
   componentDidUpdate() {
@@ -96,12 +98,23 @@ class TagSelect extends React.Component {
 
   componentWillUnmount() {
     ee.off('editor:add-tag', this.handleAddTag)
+    ee.off('sidebar:rename-tag', this.handleRenameTag)
   }
 
   handleAddTag() {
     this.refs.newTag.input.focus()
   }
 
+  handleRenameTag(event, tagChange) {
+    const { value } = this.props
+    const { tag, updatedTag } = tagChange
+    const newTags = value.slice()
+
+    newTags[value.indexOf(tag)] = updatedTag
+    this.value = newTags
+    this.props.onChange()
+  }
+
   handleTagLabelClick(tag) {
     const { dispatch } = this.props
 
diff --git a/browser/main/SideNav/index.js b/browser/main/SideNav/index.js
index cd11e652..c2f04116 100644
--- a/browser/main/SideNav/index.js
+++ b/browser/main/SideNav/index.js
@@ -6,6 +6,7 @@ import dataApi from 'browser/main/lib/dataApi'
 import styles from './SideNav.styl'
 import { openModal } from 'browser/main/lib/modal'
 import PreferencesModal from '../modals/PreferencesModal'
+import RenameTagModal from 'browser/main/modals/RenameTagModal'
 import ConfigManager from 'browser/main/lib/ConfigManager'
 import StorageItem from './StorageItem'
 import TagListItem from 'browser/components/TagListItem'
@@ -170,6 +171,11 @@ class SideNav extends React.Component {
       )
     })
 
+    menu.push({
+      label: i18n.__('Rename Tag'),
+      click: this.handleRenameTagClick.bind(this, tag)
+    })
+
     context.popup(menu)
   }
 
@@ -193,6 +199,16 @@ class SideNav extends React.Component {
     })
   }
 
+  handleRenameTagClick(tagName) {
+    const { data, dispatch } = this.props
+
+    openModal(RenameTagModal, {
+      tagName,
+      data,
+      dispatch
+    })
+  }
+
   handleColorPickerConfirm(color) {
     const {
       dispatch,
diff --git a/browser/main/modals/RenameFolderModal.js b/browser/main/modals/RenameFolderModal.js
index a8d6f386..93823e41 100644
--- a/browser/main/modals/RenameFolderModal.js
+++ b/browser/main/modals/RenameFolderModal.js
@@ -1,7 +1,7 @@
 import PropTypes from 'prop-types'
 import React from 'react'
 import CSSModules from 'browser/lib/CSSModules'
-import styles from './RenameFolderModal.styl'
+import styles from './RenameModal.styl'
 import dataApi from 'browser/main/lib/dataApi'
 import { store } from 'browser/main/store'
 import ModalEscButton from 'browser/components/ModalEscButton'
diff --git a/browser/main/modals/RenameFolderModal.styl b/browser/main/modals/RenameModal.styl
similarity index 93%
rename from browser/main/modals/RenameFolderModal.styl
rename to browser/main/modals/RenameModal.styl
index 435aa6a0..f1a37b33 100644
--- a/browser/main/modals/RenameFolderModal.styl
+++ b/browser/main/modals/RenameModal.styl
@@ -46,13 +46,18 @@
   font-size 14px
   colorPrimaryButton()
 
+.error
+  text-align center
+  color #F44336
+  height 20px
+
 apply-theme(theme)
   body[data-theme={theme}]
     .root
       background-color transparent
 
     .header
-      background-color get-theme-var(theme, 'button--hover-backgroundColor')
+      background-color transparent
       border-color get-theme-var(theme, 'borderColor')
       color get-theme-var(theme, 'text-color')
 
diff --git a/browser/main/modals/RenameTagModal.js b/browser/main/modals/RenameTagModal.js
new file mode 100644
index 00000000..8d2d0249
--- /dev/null
+++ b/browser/main/modals/RenameTagModal.js
@@ -0,0 +1,196 @@
+import PropTypes from 'prop-types'
+import React from 'react'
+import CSSModules from 'browser/lib/CSSModules'
+import styles from './RenameModal.styl'
+import dataApi from 'browser/main/lib/dataApi'
+import ModalEscButton from 'browser/components/ModalEscButton'
+import i18n from 'browser/lib/i18n'
+import { replace } from 'connected-react-router'
+import ee from 'browser/main/lib/eventEmitter'
+import { isEmpty } from 'lodash'
+import electron from 'electron'
+
+const { remote } = electron
+const { dialog } = remote
+
+class RenameTagModal extends React.Component {
+  constructor(props) {
+    super(props)
+
+    this.nameInput = null
+
+    this.handleChange = this.handleChange.bind(this)
+
+    this.setTextInputRef = el => {
+      this.nameInput = el
+    }
+
+    this.state = {
+      name: props.tagName,
+      oldName: props.tagName
+    }
+  }
+
+  componentDidMount() {
+    this.nameInput.focus()
+    this.nameInput.select()
+  }
+
+  handleChange(e) {
+    this.setState({
+      name: this.nameInput.value,
+      showerror: false,
+      errormessage: ''
+    })
+  }
+
+  handleKeyDown(e) {
+    if (e.keyCode === 27) {
+      this.props.close()
+    }
+  }
+
+  handleInputKeyDown(e) {
+    switch (e.keyCode) {
+      case 13:
+        this.handleConfirm()
+    }
+  }
+
+  handleConfirm() {
+    if (this.state.name.trim().length > 0) {
+      const { name, oldName } = this.state
+      this.renameTag(oldName, name)
+    }
+  }
+
+  showError(message) {
+    this.setState({
+      showerror: true,
+      errormessage: message
+    })
+  }
+
+  renameTag(tag, updatedTag) {
+    const { data, dispatch } = this.props
+
+    if (tag === updatedTag) {
+      // confirm with-out any change - just dismiss the modal
+      this.props.close()
+      return
+    }
+
+    if (
+      data.noteMap
+        .map(note => note)
+        .some(note => note.tags.indexOf(updatedTag) !== -1)
+    ) {
+      const alertConfig = {
+        type: 'warning',
+        message: i18n.__('Confirm tag merge'),
+        detail: i18n.__(
+          `Tag ${tag} will be merged with existing tag ${updatedTag}`
+        ),
+        buttons: [i18n.__('Confirm'), i18n.__('Cancel')]
+      }
+
+      const dialogButtonIndex = dialog.showMessageBox(
+        remote.getCurrentWindow(),
+        alertConfig
+      )
+
+      if (dialogButtonIndex === 1) {
+        return // bail early on cancel click
+      }
+    }
+
+    const notes = data.noteMap
+      .map(note => note)
+      .filter(
+        note => note.tags.indexOf(tag) !== -1 && note.tags.indexOf(updatedTag)
+      )
+      .map(note => {
+        note = Object.assign({}, note)
+        note.tags = note.tags.slice()
+
+        note.tags[note.tags.indexOf(tag)] = updatedTag
+
+        return note
+      })
+
+    if (isEmpty(notes)) {
+      this.showError(i18n.__('Tag exists'))
+
+      return
+    }
+
+    Promise.all(
+      notes.map(note => dataApi.updateNote(note.storage, note.key, note))
+    )
+      .then(updatedNotes => {
+        updatedNotes.forEach(note => {
+          dispatch({
+            type: 'UPDATE_NOTE',
+            note
+          })
+        })
+      })
+      .then(() => {
+        if (window.location.hash.includes(tag)) {
+          dispatch(replace(`/tags/${updatedTag}`))
+        }
+        ee.emit('sidebar:rename-tag', { tag, updatedTag })
+        this.props.close()
+      })
+  }
+
+  render() {
+    const { close } = this.props
+    const { errormessage } = this.state
+
+    return (
+      <div
+        styleName='root'
+        tabIndex='-1'
+        onKeyDown={e => this.handleKeyDown(e)}
+      >
+        <div styleName='header'>
+          <div styleName='title'>{i18n.__('Rename Tag')}</div>
+        </div>
+        <ModalEscButton handleEscButtonClick={close} />
+
+        <div styleName='control'>
+          <input
+            styleName='control-input'
+            placeholder={i18n.__('Tag Name')}
+            ref={this.setTextInputRef}
+            value={this.state.name}
+            onChange={this.handleChange}
+            onKeyDown={e => this.handleInputKeyDown(e)}
+          />
+          <button
+            styleName='control-confirmButton'
+            onClick={() => this.handleConfirm()}
+          >
+            {i18n.__('Confirm')}
+          </button>
+        </div>
+        <div className='error' styleName='error'>
+          {errormessage}
+        </div>
+      </div>
+    )
+  }
+}
+
+RenameTagModal.propTypes = {
+  storage: PropTypes.shape({
+    key: PropTypes.string
+  }),
+  folder: PropTypes.shape({
+    key: PropTypes.string,
+    name: PropTypes.string
+  })
+}
+
+export default CSSModules(RenameTagModal, styles)