Pensioners in the North are £107 a week worse off than their Southern counterparts, stats have shown.
Southern couples get an average of £639 a week from combined state and private pensions.
But in the North, the weekly figure falls to £532.
There is also a divide in net income for single pensioners, according to the Liberal Democrat study.
It found that from 2016-19, UK pensioners averaged £265 a week, after housing costs. In the North West it was £245 but rose to £278 in the South.
John Leech, Lib Dem spokesman for the North, called the figures yet another example of the UK’s widening inequality.
Richard Kilpatrick, party spokesman for Manchester, added: “Pensioners in northern cities and towns are losing out on money that is considered the norm in the capital.
“When the coronavirus crisis is over, the Government must protect pensioners and commit to investing in the North.
“Our most vulnerable pensioners in the north have to battle against a system completely obsessed with London and the South.
“It is time to take the North/South divide and its impact on people’s lives seriously.”
