David Sidney Thomas (12 November 1919 — 19 January 2012) was a Welsh professional footballer who played as a winger.
After playing local amateur football as a teenager, he joined Fulham in 1938 after impressing in a trial match, however, due to the outbreak of World War Two, he did not make his professional debut until 1946.
He helped the side win promotion to the First Division in 1949 but left the club the following year to sign for Bristol City.
However, he was forced to retire from football soon after having contracted tuberculosis.