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Customers trying to access their Santander, HSBC, Natwest and Halifax online accounts have been locked out as servers appear to be down.
First Direct and Marks & Spencer banks, which are both run by HSBC, The Co-operative bank, Lloyds and Royal Bank of Scotland customers are also reporting issues.
Website and mobile app services are affected this morning leaving users locked out of their accounts.
It is understood that the outage is linked to Sky broadband and Wi-Fi, the Mirror reports.
More than 900 customers have reported the outage at Santander on Downdetector, a website that tracks which services are down or having problems.
One user commented on Downdectector that he has been trying to access Santander services since 3am this morning.
They said: Been trying since about 3am my car insurance is due today so hopefully it still gets taken out, and need petrol to get to hospital today.
A second person commented: Unable to get into the app - server is not responding
While a third said: Been trying since 6am can not connect to server.
And another added: Tried to log on at 4am this morning, now 6.30am and the server is still down.
The outage is being reported across the country, however the Downdetector live map shows that people living primarily in Manchester, London, Cardiff and Brighton are tracking the outage.
Santander is yet to respond.
*Update: Sky issued a statement at 11am on Friday, August 20.
A Sky spokesperson said: We have resolved the issue with Sky Broadband. Customers should be able to access websites and apps as normal. We’re sorry for any inconvenience this may have caused.

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