John Jeffrey Leal (born December 13, 1954) is a Canadian politician who serves as the 63rd and current mayor of Peterborough. Previously, he was a member of the Legislative Assembly of Ontario from 2003 to 2018 who represented the riding of Peterborough. He served in the cabinet of Kathleen Wynne. On October 24, 2022 he was elected mayor of Peterborough.

John Jeffrey Leal was born and raised in Peterborough. He attended Kenner Collegiate and has a Bachelor of Arts (Honours) degree in Economics and Political Science from Trent University (1978) and a degree in Business Administration from the University of Windsor (1981). Leal worked as executive assistant to members of Provincial Parliament (MPPs) John Eakins and Larry South in the 1980s. He was a health and safety representative for Coyle Corrugated Containers. He is married to Karan, a teacher and school principal, with two children, Braden and Shanae.

On April 10th, 2025 the Peterborough Examiner obtained an audio recording of Leal using a racial slur (the N-word) against Black people during his appearance as a guest lecturer at a Trent University business administration class. He has since issued an apology but has refused to confirm the nature of the word's usage.

In May 2025, the city's integrity commissioner also published a report alleging that Leal had intimidated and bullied two councilors. Media reports allege that Leal threatened a city councilor during a public meeting by saying that he would "carve him like a Thanksgiving turkey." In June council voted against penalizing Leal for his comments.

He served on the Peterborough City Council from 1985 to 2003, representing the Otonabee Ward. At City Hall he was appointed as Deputy Mayor (1993-2003) and chaired the social services committee after the 2000 municipal election. In July 2022, Leal announced his candidacy for mayor of Peterborough, which he would later win.

Leal ran for provincial office in the 1999 provincial election as the Liberal candidate. He was narrowly defeated by Progressive Conservative incumbent Gary Stewart. He defeated Stewart by over six thousand votes in a 2003 rematch, amid a provincial shift to the Liberal Party. Leal was re-elected in 2007, 2011 and 2014.

During his time in government, he has served as Parliamentary Assistant to several ministers including Ministry of Training, Colleges and Universities (2004), Ministry of Economic Development and Trade (2005), Ministry of Energy (2005), Ministry of the Environment (2006), and the Ministry of Aboriginal Affairs (2007–09). In February 2010, he was named the Chief Government Whip.

In February 2013, Premier Kathleen Wynne named Leal to Ontario's Cabinet, serving in the role as Minister of Rural Affairs.