Peter Christopher Roland Nattrass (born 15 October 1941) is a Perth-based Australian gynaecologist, businessman, and politician.
He attended Hale School, University of Western Australia (UWA) and the Royal College of Obstetricians and Gynaecologists (RCOG) in London.
His political career culminated in his election as Lord Mayor of Perth in 1995 succeeding Reg Withers.
His term in the office of Lord Mayor is the longest held for the City of Perth.
Nattrass was succeeded by the first female Lord Mayor of Perth, Lisa Scaffidi on 21 October 2007.