Tommy Berntsen (born 18 December 1973) is a Norwegian former professional footballer who played as a defender.
Berntsen began his playing career at Vålerenga, but failed to make the first team.
He spent the next few years in the lower divisions, playing for local clubs Lørenskog IF and Skjetten SK.
His breakthrough came in 1998 when he signed for Lillestrøm, where he and his teammate Torgeir Bjarmann made up one of the best central defences in the Norwegian Tippeligaen (Premier Division).
Berntsen has struggled with injuries over several periods, but always remained the captain and featured regularly in the Lyn side the last seasons of his career.