Rainer Mahlamäki (born 12 June 1956) is a Finnish architect, president of the Finnish Association of Architects (SAFA) from 2007 to 2011, Professor of Contemporary Architecture at the University of Oulu, and joint partner with Ilmari Lahdelma of the Helsinki-based architecture firm Lahdelma & Mahlamäki Architects, one of the most prolific such firms in Finland.

In 2007 to 2011 he was appointed President of the Finnish Association of Architects (SAFA).

Mahlamäki was the Chair of the Jury for the 2009 International Architecture Awards.

The style of the firm has been described as contextual, varying dramatically in character depending on the project, from minimalism to expressionism.

The contextualism is typified by Lahdelma's design of the Jyväskylä University Teacher Training School (2002) built adjacent to several buildings on the university campus designed by Alvar Aalto.