Lukas Hartmann (29 August 1944 born as Hans-Rudolf Lehmann) is a Swiss author.

Born as Hans-Rudolf Lehmann in Bern, his mother was a farmer's daughter and his father was a shoemaker, later auxiliary postman and department manager at the Swiss Post.

Hartmann's younger brother Jürg became a journalist, and now heads the Ringier Group school of journalism.

He then decided to pursue further studies in psychology, but he did not graduate, and later worked as a social worker, journalist and writer.

[3] Since 1996 Hartmann has been married to the Swiss politician Simonetta Sommaruga.