Thomas John Lewis (born 16 April 1943) is a British singer and songwriter of nautical music whose works have become folk standards. His best-known song is [[song:a-sailor-aint-a-sailor|The Last Shanty (A Sailor Ain’t a Sailor)]], and he has been recorded by over 40 other artists including Nathan Evans. Other popular Lewis originals include A Sailor's Prayer and Captain Nipper.

Lewis was born in Belfast, Northern Ireland and grew up in Gloucester, England. At age 16 he joined the Royal Navy as an engineering apprentice, serving for 24 years, primarily in the Submarine Service operating out of HMS Dolphin in Gosport. In 1960, he transferred to a naval base in Scotland and began attending the Howff Folk Club in Dunfermline, where he was exposed to artists such as Archie Fisher, Alex Glasgow, Ewan MacColl, Tom Paxton, and Louis Killen. He was also influenced heavily by the music of Cyril Tawney.

His first solo album, Surfacing (1987), was praised by Canadian Folk Music as “the sharpest collection of contemporary sea shanties I have ever run across.” In 1988 he recorded and toured with William Pint and Felicia Dale. He has also recorded two albums with Polish maritime band QFTRY: Po!es Apart (2010) and Po!es Apart Too: The Song Goes On.

In 2008, Lewis published his tunes and lyrics as Worth the Singin’: the Tom Lewis Songbook. He plays the ukulele and the button accordion.