Denis Dallan (born 4 March 1978) is an Italian rugby union footballer.
Dallan has been capped for the national team and was a part of its squad at the 2003 Rugby World Cup in Australia.
He made his first appearance for Italy in 1999 and since then has earned 40 caps for the national team.
He became a regular in the Italian Test side, and in 2003 was included in its World Cup squad for Australia.
Dallan is an accomplished singer and led the singing of the Italian national anthem for the international against the All Blacks held at the San Siro Stadium in November 2009.