Stewart Marshall "Steve" Llewellyn (29 February 1924 – 10 December 2002) was a Welsh professional rugby league footballer who rose to prominence in the 1950s. A Wing, born in Abertyleri, Blaenau Gwent, he equalled the St. Helens' club record for most tries in a match twice by scoring six against Castleford on 3 March 1956, and again against Liverpool City on 20 August 1956.