Brett Roneberg (born 5 February 1979 in Sandringham, Victoria) is an Australian baseball player.
He spent 11 seasons playing minor league baseball, most recently in 2007 was with the Pittsburgh Pirates organization, playing for their Double-A affiliate, the Altoona Curve.
In 2004, he was part of the Australian Olympic baseball team, who achieved a Silver Medal in the baseball tournament at the Athens Olympics. He had also represented Australia at the 2000 Summer Olympics.
In the 2009 World Baseball Classic, Roneberg led the tournament in batting average (.714), slugging percentage (1.286) and on-base plus slugging (2.036).