| Peter Costigan | |
| Nationality: | Australian |
| Order: | 101st Lord Mayor of Melbourne |
| Term Start: | May 1999 |
| Term End: | 22 July 2001 |
| Deputy: | Wellington Lee Clem Newton-Brown |
| Predecessor: | Ivan Deveson |
| Successor: | John So |
| Birth Date: | 21 June 1935 |
| Birth Place: | Melbourne, Australia |
| Death Place: | Melbourne, Australia |
| Spouse: | Susie Norton |
| Party: | Independent |
Peter Costigan (21 June 1935 - 5 August 2002) was an Australian journalist and Lord Mayor of Melbourne from 1999 to 2001.
Costigan grew up in Preston, a suburb of Melbourne and was educated by the Jesuits at St Patricks College, East Melbourne. He completed his tertiary education at the University of Melbourne.
Costigan unsuccessfully contested the 1996 Melbourne City Council election on the "Melbourne First" ticket.[1]
In 1999, he was elected a councillor of the City of Melbourne and subsequently elected lord mayor by fellow Councillors, defeating rival Councillor John So with a majority of 5-to-4 votes.[2]
Costigan was the younger brother of the twins Michael and Frank Costigan.[3]