Diogo Coutinho (born 3 September 1977 in Lisbon) is a former Portuguese rugby union footballer.
He played as a flanker for Direito, a Lisbon team.
He had 35 caps for Portugal, from 2000 to 2007, scoring 4 tries, 20 points in aggregate.
Coutinho played in three games at the 2007 Rugby World Cup, and was chosen as the Man of the Match in the 10-14 loss to Romania.
His last cap was at 1 December 2007, in an 8-23 loss to Romania.