Key facts
- UK Labour Party membership fell by 20% in 2025, reaching 264,754 members.
- This represents a decrease from 333,235 members in 2024.
- Keir Starmer resigned as prime minister in June 2025.
- Membership peaked at over half a million under former leader Jeremy Corbyn.
- The Green Party reported significant membership growth during the same period.
The UK Labour Party experienced a significant decline in membership in 2025, losing 20% of its members to reach 264,754, according to party accounts filed with the Electoral Commission. This marks a substantial drop from the 333,235 members recorded in 2024 and contrasts sharply with the peak of over half a million members during Jeremy Corbyn's leadership.
Keir Starmer, who led the party to a landslide victory in 2024, resigned as prime minister in June 2025 after facing internal dissent and a series of policy U-turns. The party's shift towards the economic center and stricter stances on issues like immigration and welfare are cited as reasons for alienating its more left-wing membership base. Starmer himself had previously indicated that members unhappy with the party's direction were free to leave.
In contrast, the Green Party has seen substantial membership growth, increasing from 68,000 in September 2025 to over 200,000 by March 2026, potentially attracting former Labour members. The Conservative Party also reported a drop in income from its members, from £2.1 million in 2024 to £1.7 million in 2025.
New Labour leader and prime minister Andy Burnham faces the challenge of reversing this membership decline. A Labour spokesperson stated, "The Labour Party is proud to be powered by our dedicated Party members and supporters who fight day after day for Labour victories to change the country for the better."