Donald Barry Llewelyn (born 6 January 1948) is a retired Welsh rugby union player who gained 13 caps for Wales as a prop between 1970 and 1972.
Barry was born in Ashton, Lancashire and educated at Llanelli Grammar School.
He began his first-class rugby union career at Llanelli, and joined Newport RFC in the 1968-69 season while studying at Caerleon College of Education.
He made his Newport debut at in a 6-5 win at Pontypool on 13 November 1968.
He made his Wales debut on 24 January 1970 against South Africa and gained 13 caps in total, 5 with Newport and 8 after he returned to Llanelli in the 1970-71 season.
In his two seasons at Newport (1968-69 and 1969/70) he made 39 appearancess and scored 6 tries.Llewelyn also played for Carmarthen Athletic, Hendy, Newbridge, Loughborough College and the Barbarians.