Siddell is a surname of Northern English origin, a variant of Siddall. Notable people with the surname include:
Emily Siddell (born 1971), New Zealand artist Kevin Siddell (1924–2004), New Zealand-born Australian pianist, composer, and public service official Peter Siddell (1935–2011), New Zealand artist Sylvia Siddell (1941–2011), New Zealand painter, etcher, and screen-printer, based in Auckland
References
See also Siddle, another surname Siddells, another surname