Bertil Dillner (12 May 1923 in Lit Jämtland, Sweden – 9 May 2015 in Linköping) was a Swedish aeronautical engineer[1] and aerodynamic expert.

He worked under Erik Bratt and Tore Gullstrand, in the Saab design team with Hermann Behrbohm, Olof Ljungström and Einar Bergström.

This with really fast supersonic-delta wing-fighter aircraft such as Saab 35 Draken, where speed and preparedness were the key factors.

Economy and materials engineering for friction heat of the atmosphere set the limit for speed.

Bertil Dillner chaired the Swedish Club North West between 1996 and 1997 and returned to Linköping and Sweden in 2005.