Steffen Lehmann (born 19 June 1963) is a German-born architect and urban designer.

Lehmann held the UNESCO Chair in Sustainable Urban Development for Asia and the Pacific from 2008 to 2010.

[2] Lehmann is the founding director of the s_Lab Space Laboratory for Architectural Research and Design (Sydney-Berlin), which he opened in 1993.

[4] Since 2006 Lehmann has been the editor of the US-based Journal of Green Building, and works as an advisor to various governments and municipalities.

He has been a juror for international design competitions, such as Leipziger Platz in Berlin, Etihad Towers in Abu Dhabi and Harmony Point in Ho-Chi-Minh City.