Jan Thesleff (born 6 January 1959 in Lund) is a Swedish diplomat.

For next two years he was project manager and controller of Alfa Laval in Lund then he started The Ministry of Foreign Affairs' diplomatic program.

In 1999 he became member of Embassy Council at the Swedish European Union representation in Brussels with responsibility for the Middle East and North Africa issues.

Next he became Political Advisor to European Union Special Envoy for Peace Middle East process.

[3] In October 2020 Ambassador Jan Thesleff was appointed to Commissioner General – to lead the work in the Committee for Sweden´s Participation at Expo 2020 in Dubai.