Hans Johannes Kruus (22 October 1891 – 30 June 1976) was an Estonian historian, academic and politician. As well as sitting in the Estonian parliament and the Supreme Soviet of the Estonian SSR, he was Deputy Prime Minister of Estonia in 1940 and Foreign Minister of the Estonian SSR between 1944 and 1950. He was also Rector of the University of Tartu in 1940–41 and in 1944.