Lumby is a surname. Notable people with the surname include:

Catharine Lumby, Australian academic, author and journalist Gary Lumby, British banker Jeff Lumby, Canadian actor Jim Lumby, soccer player Joseph Rawson Lumby (1831–95), English cleric, academic, author and divine Thomas and Henry Lumby, 18th-century English architects Walter Lumby, English footballer Wendy Lumby (born 1966), British alpine skier

See also Lumbye