Lloyds updated its climate policy to make the change, which bars project financing or reserve-based lending to greenfield oil and gas projects, although the policy would still mean it could provide general lending to companies in the industry.
read moreClimate groups welcomed the Lloyds move and called on other British banks to follow suit.
"By becoming the first of the five largest UK high street banks to stop the direct financing of new gas, oil, and coal projects, Lloyds is making a clear statement on the future of financing for fossil fuel expansion."
Lloyds' exposure to dirty industries is smaller than some of its global rivals, given its focus on Britain's economy.
The bank provided about 1 billion pounds ($1.1 billion) of finance to commercial oil and gas customers last year, according to its latest climate disclosures report, and the sector accounted for just 0.2% of its overall lending.