Rein Aidma (born 28 September 1950, in Sälliksaare) is an Estonian politician and pedagogue who was a member of the Riigikogu, representing the Estonian Reform Party from 2003 to 2015.

Aidma graduated from Nõo Secondary School in 1970 and earned a degree in physics from the University of Tartu in 1975.

He worked as a director and teacher at Iisaku Secondary School from 1975 to 1989.

He was the deputy chairman of the executive committee of Ida-Viru County from 1989 to 1991 and the governor of Ida-Viru County from 1994 to 2003, where he was succeeded by Ago Silde.

In 2007, Aidma paid a total of 5,223 kr to Saka Cliff Hotel and Spa at a cost of living from December 27, indicating that the event was an annual summing up with voters.