Matthew John "Matt" Elias (born 25 April 1979) is a retired Welsh athlete who specialised in the 400 metres sprint and 400 metres hurdles.
During his international career he represented Great Britain.
In 2003 he won a gold medal at the European Championships and at the 2004 Olympic Games in Athens he finished 5th in the 4 × 400 m relay, He is also a part of Super Schools.
He won the European Under 23 Championships for the 400m hurdles in 2001 in a time of 49.57.
The following year he was to have his most prolific season winning two silver medals in the 2002 Commonwealth Games in Manchester.
Elias was born in Cardiff.