diff --git a/README.md b/README.md
index f604184..459756a 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,7 @@ Xcode will be installed to /Applications by default, but you can provide the pat
 - `uninstall`: Uninstall a specific version of Xcode
 - `update`: Update the list of available versions of Xcode
 - `version`: Print the version number of xcodes itself
+- `signout`: Clears the stored username and password
 
 ### Shell Completion Scripts
 
diff --git a/Sources/AppleAPI/Client.swift b/Sources/AppleAPI/Client.swift
index ef4cec4..dc656c2 100644
--- a/Sources/AppleAPI/Client.swift
+++ b/Sources/AppleAPI/Client.swift
@@ -16,6 +16,7 @@ public class Client {
         case unexpectedSignInResponse(statusCode: Int, message: String?)
         case appleIDAndPrivacyAcknowledgementRequired
         case noTrustedPhoneNumbers
+        case notAuthenticated
 
         public var errorDescription: String? {
             switch self {
@@ -27,6 +28,8 @@ public class Client {
                 return "Not a valid phone number index. Expecting a whole number between \(min)-\(max), but was given \(given ?? "nothing")."
             case .noTrustedPhoneNumbers:
                 return "Your account doesn't have any trusted phone numbers, but they're required for two-factor authentication. See https://support.apple.com/en-ca/HT204915."
+            case .notAuthenticated:
+                return "You are already signed out"
             default:
                 return String(describing: self)
             }
diff --git a/Sources/XcodesKit/XcodeInstaller.swift b/Sources/XcodesKit/XcodeInstaller.swift
index 5f97664..30fecca 100644
--- a/Sources/XcodesKit/XcodeInstaller.swift
+++ b/Sources/XcodesKit/XcodeInstaller.swift
@@ -399,6 +399,25 @@ public final class XcodeInstaller {
             }
         }
     }
+    
+    public func logout() -> Promise<Void> {
+        guard let username = findUsername() else { return Promise<Void>(error: Client.Error.notAuthenticated) }
+        
+        return Promise { seal in
+            // Remove cookies in the shared URLSession
+            AppleAPI.Current.network.session.reset {
+                seal.fulfill(())
+            }
+        }
+        .done {
+            // Remove all keychain items
+            try Current.keychain.remove(username)
+
+            // Set `defaultUsername` in Configuration to nil
+            self.configuration.defaultUsername = nil
+            try self.configuration.save()
+        }
+    }
 
     let xcodesUsername = "XCODES_USERNAME"
     let xcodesPassword = "XCODES_PASSWORD"
diff --git a/Sources/xcodes/main.swift b/Sources/xcodes/main.swift
index 090fdd2..7b9a80e 100644
--- a/Sources/xcodes/main.swift
+++ b/Sources/xcodes/main.swift
@@ -55,7 +55,7 @@ struct Xcodes: ParsableCommand {
     static var configuration = CommandConfiguration(
         abstract: "Manage the Xcodes installed on your Mac",
         shouldDisplay: true,
-        subcommands: [Download.self, Install.self, Installed.self, List.self, Select.self, Uninstall.self, Update.self, Version.self]
+        subcommands: [Download.self, Install.self, Installed.self, List.self, Select.self, Uninstall.self, Update.self, Version.self, Signout.self]
     )
     
     static var xcodesConfiguration = Configuration()
@@ -422,6 +422,31 @@ struct Xcodes: ParsableCommand {
             Current.logging.log(XcodesKit.version.description)
         }
     }
+    
+    struct Signout: ParsableCommand {
+        static var configuration = CommandConfiguration(
+            abstract: "Clears the stored username and password"
+        )
+        
+        @OptionGroup
+        var globalColor: GlobalColorOption
+        
+        func run() {
+            Rainbow.enabled = Rainbow.enabled && globalColor.color
+            
+            installer.logout()
+                .done {
+                    Current.logging.log("Successfully signed out".green)
+                    Signout.exit()
+                }
+                .recover { error in
+                    Current.logging.log(error.legibleLocalizedDescription)
+                    Signout.exit()
+                }
+            
+            RunLoop.current.run()
+        }
+    }
 }
 
 // @main doesn't work yet because of https://bugs.swift.org/browse/SR-12683
diff --git a/Tests/XcodesKitTests/XcodesKitTests.swift b/Tests/XcodesKitTests/XcodesKitTests.swift
index 64176b4..947716e 100644
--- a/Tests/XcodesKitTests/XcodesKitTests.swift
+++ b/Tests/XcodesKitTests/XcodesKitTests.swift
@@ -1212,5 +1212,47 @@ final class XcodesKitTests: XCTestCase {
             """
         )
     }
+    
+    func test_Signout_WithExistingSession() {
+        var keychainDidRemove = false
+        Current.keychain.remove = { _ in
+            keychainDidRemove = true
+        }
+        
+        var customConfig = Configuration()
+        customConfig.defaultUsername = "test@example.com"
+        let customInstaller = XcodeInstaller(configuration: customConfig, xcodeList: XcodeList())
+        
+        let expectation = self.expectation(description: "Signout complete")
+        
+        customInstaller.logout()
+            .ensure { expectation.fulfill() }
+            .catch {
+                XCTFail($0.localizedDescription)
+            }
+        
+        waitForExpectations(timeout: 1.0)
+        
+        XCTAssertTrue(keychainDidRemove)
+    }
+    
+    func test_Signout_WithoutExistingSession() {
+        var customConfig = Configuration()
+        customConfig.defaultUsername = nil
+        let customInstaller = XcodeInstaller(configuration: customConfig, xcodeList: XcodeList())
+        
+        var capturedError: Error?
+        
+        let expectation = self.expectation(description: "Signout complete")
+        
+        customInstaller.logout()
+            .ensure { expectation.fulfill() }
+            .catch { error in
+                capturedError = error
+            }
+        waitForExpectations(timeout: 1.0)
+        
+        XCTAssertEqual(capturedError as? Client.Error, Client.Error.notAuthenticated)
+    }
 
 }