Basil of Baker Street is a series of children's novels written by Eve Titus and illustrated by Paul Galdone. The stories focus on the titular Basil of Baker Street and his personal biographer Doctor David Q. Dawson. Together they solve the many crimes and cases of the mouse world. Both live in Holmestead, a mouse community built in the cellar of 221B Baker Street, where Sherlock Holmes is a tenant upstairs.
The five original titles were published from 1958 to 1982 by McGraw-Hill. The series was revived three decades later when a new work was published by Aladdin Paperbacks in October 2018, written by Cathy Hapka and illustrated by David Mottram. Two more adventures followed in 2019 and 2020.
The 1986 Disney animated feature The Great Mouse Detective was based on these novels.