Open the Gmail app or your phone’s Settings
Tap your profile picture or account icon
Select Manage accounts on this device or Accounts
Tap the Gmail account you want to remove
Choose Remove account
Confirm by tapping Remove account again
If needed, enter your phone PIN, pattern, or password
On iPhone, go to Settings > Mail > Accounts or Settings > Passwords & Accounts
Select the Gmail account
Tap Delete Account
Confirm deletion