YouTube has issued a statement as Google services including Gmail and Docs are down.
According to DownDetector, the issues started at around 11:56 GMT, and are affecting users worldwide.
However, of those who reported issues with YouTube, 54% said they couldn't access the website, 42% couldn't watch videos and 3% were struggling to log-in.
And of those who reported problems with Gmail, 75% couldn't log-in, 15% couldn't access the website, and 8% were not receiving messages.
While Google has yet to comment on the outage, YouTube issued a statement on Twitter.
Team YouTube tweeted: "We are aware that many of you are having issues accessing YouTube right now – our team is aware and looking into it.
"We'll update you here as soon as we have more news."
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