The boy band are worth a combined fortune of £59.3m, reportedly each earning £5 million each this year alone.
One Direction were included as a single entry in the list of richest stars compiled by Heat Magazine as they earned their mega wedge as a group, not individuals.
The studs knocked Harry Potter star Danielle Radcliffe off the top spot for the first time, who has been the most minted since 2010, with an estimated worth of £56.19m.
DJ Calvin Harris made it into the top ten for the first time as he is now worth an estimated £22.1m, meanwhile Sienna Miller, Paolo Nutini and Jamie Bell fell off the list.
Top 10 richest British celebs under 30
1 (5) One Direction, £59.33m
2 (1) Daniel Radcliffe, £56.19m
3 (2) Robert Pattinson, £44.16m
4 (3) Keira Knightley, £37.28m
5 (4) Emma Watson, £27.93m
6 (6) Adele, £27.54m
7 (7) Rupert Grint, £24.09m
8 (-) Calvin Harris, £22.21m
9 (9) Cheryl Cole, £15.50m
10 (8) Leona Lewis, £14.45m
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