Jeffrey Robert Lehman (born 7 June 1975) is a Canadian politician and economist who is currently serving as Chair of the District of Muskoka since 2022.

He had a ten-year career as an economist and built a consulting firm, MKI, in Ottawa and Toronto, before entering politics.

Lehman joined the faculty of the new Cities Programme at the LSE in 1998, and worked for 3 years in London as an academic before returning to Canada in late 1999.

In 2005, Lehman established the Growing By Degrees task force to expand post-secondary education opportunities for students in Barrie.

As a councillor, Lehman was the Chairman of the Finance Committee of Council in 2007 and served as the chair of the city's Growth Management Working Group in 2008.

Lehman played a prominent role in the ultimately unsuccessful battle to save two schools in his ward, Prince of Wales PS, and Barrie Central Collegiate, including starting a Facebook group called "Save Barrie Central", which attracted 3,000 members in its first week.

Lehman's campaign was the first in Barrie to use social media in a manner that is now more typical of elections in larger urban centres.

Initially beset by route and scheduling problems, the plan later helped deliver a dramatic increase in transit ridership, particularly after Georgian College and the City signed a student pass agreement a few years later.

Lehman's leadership resulted in annual tax increases declining from an average of 3.9% in the previous decade to 2.7% over the 2010 to 2020 period.

Lehman's second term was again characterized by economic expansion, further reduction in crime, and the construction of more public facilities, together with a further shifting growth patterns from suburban to more urban redevelopment.

Lehman's focus has been on housing, economic development, public space, and improving the city's fiscal condition.

He has also advocated for small business supports and changes to public health restrictions, most notably being one of several Ontario Mayors who pushed back when the Ford Government ordered playgrounds closed in April 2021.

On 15 July 2021, an F2 tornado struck south end neighbourhoods in the City of Barrie, damaging hundreds of homes and businesses.

As chair of Ontario's Big City Mayor's caucus, Lehman has advocated for the needs of large municipalities on issues affecting Ontario's cities, including advocating for decriminalization of simple possession of opioids, and the use of federal and provincial economic policies to address the housing crisis.