Mercian Cycles is a custom bicycle manufacturer based in Derby, England.

[1] The firm was founded by Tom Crowther and Lou Barker in 1946 and named after the ancient kingdom of Mercia.

[1] Early frames built by Mercian were known as "crowbars", a pun on the surnames of Crowther and Barker.

[2][3] Mercian Cycles operated a retail shop in Alvaston[3][4] until early 2019, when it relocated back to its manufacturing unit within Derby.

[4] Before steel was superseded by lighter materials, riders using Mercian won national and international competitions.