The outage began around 05:00 BST on Thursday, according to tracking site DownDetector, which showed continuing high numbers of complaints in the UK and multiple other countries for a number of Google services.
Thousands of complaints were registered on the site, with many users unable to sign in as they logged in to start the working day.
According its Gmail service dashboard, a response can be expected soon - although the company has been promising a response to users within the next few hours for most of the morning so far.
Along with Gmail, users also reported issues with Google Search and Google Drive, with many unable to login to Gmail, make searches on the company's famous home page, or upload or access content from their Google Drive account.
Others issues noted by Google included Meet recording issues, CSV user upload issues in Admin Console, and posting message issues in Google Chat. Newly reported issues include Sites adding new pages issues, Keep issues, and Voice mail issues - making this a significant outage for Google.
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