Rudolf Gottfried Kallas (22 May 1851 – 22 April 1913) was an Estonian clergyman and pedagog.
[1] 1871-1875 he was a primary school pedagog in Tartu.
After graduating he had been a pastor in Valga, Rõuge and St.
[1] Until 1881 he was a member of Estonian Literary Society.
[1] His "System der Gedächtnislehre" was the first scientific publication about psychology which was written by an Estonian.