Thousands of users reported issues with the major websites Google and YouTube on Friday morning.
The search engine's email service Gmail also went down, according to reports on social media.
One person said: "Gmail is down just when I need to send an important email!"
DownDetectorUK, an analytics account, said problems started at just before 8:45am.
"User reports indicate Gmail is having problems since 8:44 AM GMT," it said on Twitter.
"RT if you're also having problems #Gmaildown."
Have you had problems with Google, Gmail or YouTube? Email webnews@mirror.co.uk.
According to DownDetectorUK, more than 1,000 reported problems with Google over several hours.
At least 400 people outlined similar issues with YouTube - which is owned by Google.
The outages appear to have impacted the UK most heavily.
But users in countries such as Spain and Kenya were also reporting problems.
People in the United States appeared to be largely unaffected.
Many Gmail users appear to be getting a 502 error when trying to access their emails.
It reads: "The server encountered a temporary error and could not complete your request."
A Google spokesperson said: "On Friday November 12 around 08:30 am UTC, some of our users experienced a service disruption to Google Cloud services, including Google Workspace.
"This issue is now resolved. For more details, please see our status dashboards for Google Cloud and Google Workspace."
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