Stephen Mandel AOE ECA (born July 18, 1945) is a Canadian politician who served as leader of the Alberta Party from 2018 to 2019. He previously served as Alberta’s Minister of Health from 2014 to 2015 and as mayor of Edmonton for three terms from 2004 to 2013. Before becoming mayor, he was a city councillor for three years.

On September 15, 2014, he was made Minister of Health by premier Jim Prentice, despite not holding a seat in the Legislative Assembly of Alberta. He was subsequently named as the Alberta Progressive Conservative Party's candidate in a by-election in Edmonton-Whitemud, the seat formerly held by Dave Hancock, which was scheduled for October 27, 2014. He won in the byelection but was subsequently defeated in the general election on May 5, 2015.

Mandel announced his candidacy for the leadership of the Alberta Party on January 10, 2018. He was elected on February 27, 2018, defeating two other candidates. Mandel resigned as Alberta Party leader in June, 2019. Mandel was made a member of the Alberta Order of Excellence in 2024.

Mandel received an associate of arts degree from Lincoln College in Lincoln, Illinois, a bachelor of science in business administration from Miami University, and his masters in political science from the University of Windsor.

He moved to Edmonton in 1972 from Windsor, Ontario.

Mandel owns the Strathcona County’s Lakeland Village mobile home park.

Prior to being elected to city council, Mandel ran unsuccessfully for school trustee He was first elected to the Edmonton City Council in 2001 as a councillor for Ward 1. In 2004, he became mayor by defeating Edmonton's three-term mayor, Bill Smith. Mandel credits his successes to the hard work and spirit of cooperation of his council. Mandel left office as Mayor of Edmonton on October 29, 2013.

Mandel's city council was responsible for many infrastructural changes, some controversial: expansion of the LRT lines, the construction of a new arena for the Edmonton Oilers.