| Dr Peter Prenzler | |
| Office1: | Deputy Leader of One Nation Queensland |
| Leader1: | Bill Feldman |
| Term Start1: | 6 February 1999 |
| Term End1: | 22 April 2003 |
| Predecessor1: | Dorothy Pratt |
| Successor1: | Rosa Lee Long |
| Constituency Am: | Lockyer |
| Assembly: | Queensland Legislative |
| Term Start: | 13 June 1998 |
| Term End: | 17 February 2001 |
| Predecessor: | Tony FitzGerald |
| Successor: | Bill Flynn |
| Birth Name: | Peter Ross Prenzler |
| Birth Date: | 3 April 1952 |
| Birth Place: | Boonah, Queensland, Australia |
| Birthname: | Peter Ross Prenzler |
| Nationality: | Australian |
| Party: | City Country Alliance (1999–2003) |
| Otherparty: | One Nation (1997–1999) |
| Occupation: | Veterinary surgeon (Self–employed) |
Peter Ross Prenzler (born 3 April 1952) is a former Australian politician. Born in Boonah, he served in the Royal Australian Artillery and the Citizens Military Force 1969 - 1971. He was a veterinary surgeon at Kalbar before entering politics. In 1998, he was elected to the Legislative Assembly of Queensland as a member of Pauline Hanson's One Nation, representing the seat of Lockyer. He remained in the party until December 1999, when he and the other One Nation MPs left the party to form the City Country Alliance, of which Prenzler became deputy leader. In addition to the deputy leadership, he held the position of spokesperson for Health, Primary Industries, Aboriginal and Torres Strait Islander Policy, Natural Resources, Environment and Heritage, Fair Trading and Women's Policy. He contested the 2001 state election but was defeated by One Nation candidate Bill Flynn.[1]