diff --git a/.vscode/settings.json b/.vscode/settings.json
index aa2c374..eb72a1a 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -6,6 +6,10 @@
   "files.associations": {
     "test/data/**/*": "codeowners"
   },
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
   "[codeowners]": {
     // never autoformat test files
     "editor.defaultFormatter": null
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fda21d3..a11a36b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## 3.4.0 - 2024-04-10
+
+### Added
+
+- Slack channel mapping via `github-code-owners.team-mapping.slack` setting.
+
 ## 3.3.0 - 2023-11-15
 
 ### Added
diff --git a/package-lock.json b/package-lock.json
index a475f1a..beb5bbb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "github-code-owners",
-  "version": "3.2.0",
+  "version": "3.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "github-code-owners",
-      "version": "3.2.0",
+      "version": "3.4.0",
       "license": "SEE LICENSE IN LICENSE",
       "dependencies": {
         "@snyk/github-codeowners": "github:chdsbd/github-codeowners#chris/line-number-information",
diff --git a/package.json b/package.json
index 75691a6..93ff5b2 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "Quickly see GitHub Code Owners for the current file. Add syntax highlighting for CODEOWNERS files.",
   "publisher": "chdsbd",
   "license": "SEE LICENSE IN LICENSE",
-  "version": "3.3.0",
+  "version": "3.4.0",
   "icon": "images/logo256.png",
   "homepage": "https://github.com/chdsbd/vscode-github-code-owners/blob/master/README.md",
   "keywords": [
@@ -72,6 +72,52 @@
           "default": 4,
           "minimum": 1,
           "description": "Space offset to use from the longest file pattern the first code owner when aligning."
+        },
+        "github-code-owners.team-mapping.slack": {
+          "type": "array",
+          "default": [],
+          "markdownDescription": "Map GitHub teams to Slack channels.",
+          "items": {
+            "type": "object",
+            "properties": {
+              "team": {
+                "type": "string",
+                "examples": [
+                  "@acme-corp/frontend"
+                ],
+                "markdownDescription": "GitHub team",
+                "pattern": "^@",
+                "patternErrorMessage": "GitHub teams must start with @",
+                "required": true
+              },
+              "domain": {
+                "type": "string",
+                "markdownDescription": "Slack domain",
+                "examples": [
+                  "acme-corp.slack.com"
+                ],
+                "required": true
+              },
+              "channel": {
+                "type": "string",
+                "markdownDescription": "Slack channel",
+                "examples": [
+                  "#eng-frontend"
+                ],
+                "pattern": "^#",
+                "patternErrorMessage": "Slack channels must start with #",
+                "required": true
+              }
+            },
+            "required": true,
+            "examples": [
+              {
+                "team": "@acme-corp/frontend",
+                "domain": "acme-corp.slack.com",
+                "channel": "#eng-frontend"
+              }
+            ]
+          }
         }
       }
     }
diff --git a/src/github-usernames-link-provider.ts b/src/github-usernames-link-provider.ts
index a03e20f..effed5e 100644
--- a/src/github-usernames-link-provider.ts
+++ b/src/github-usernames-link-provider.ts
@@ -29,6 +29,26 @@ function getGitHubUrl(): string {
   return setting
 }
 
+type SlackMappingConfigurationItem = {
+  domain: string
+  channel: string
+  team: string
+}
+
+function getTeamMappingSlack() {
+  const setting =
+    vscode.workspace
+      .getConfiguration()
+      .get<Array<SlackMappingConfigurationItem>>(
+        "github-code-owners.team-mapping.slack",
+      ) ?? []
+  const mapping: Record<string, SlackMappingConfigurationItem | undefined> = {}
+  for (const team of setting) {
+    mapping[team.team] = team
+  }
+  return mapping
+}
+
 /**
  * Add links to usernames in CODEOWNERS file that open on GitHub.
  */
@@ -38,6 +58,7 @@ export class GitHubUsernamesLinkProvider
   provideDocumentLinks(
     document: vscode.TextDocument,
   ): vscode.ProviderResult<vscode.DocumentLink[]> {
+    const slackTeamMapping = getTeamMappingSlack()
     const links = []
     for (const range of findUsernameRanges(document)) {
       if (range) {
@@ -52,9 +73,25 @@ export class GitHubUsernamesLinkProvider
           range,
           githubUserToUrl(username.replace(/^@/, "")),
         )
-        link.tooltip = `View ${username} on Github`
-
+        link.tooltip = `Open ${username} on Github`
         links.push(link)
+
+        const slackMapping = slackTeamMapping[username]
+        if (slackMapping) {
+          const linkslack = new vscode.DocumentLink(
+            range,
+            // https://api.slack.com/reference/deep-linking
+            // https://acme-corp.slack.com/channels/eng-frontend
+            vscode.Uri.parse(
+              `https://${
+                slackMapping.domain
+              }/app_redirect?channel=${slackMapping.channel.replace(/^#/, "")}`,
+            ),
+          )
+          linkslack.tooltip = `Open ${slackMapping.channel} on Slack`
+
+          links.push(linkslack)
+        }
       }
     }
     return links