Karl-Johannes Soonpää (born Karl-Johannes Soonberg; 2 March 1895 in Pangodi Parish (now Kambja Parish), Kreis Dorpat – 15 June 1944 near Elva, Estonia) was an Estonian politician and civil servant. Soonpää participated in the Estonian War of Independence as a lieutenant and received the Cross of Liberty for his service. Following the reoccupation of Estonia by the Soviets in 1944, Soonpää was killed in June, aged 49, when he tried to capture Soviet saboteurs with two men at night in the forest near Elva. He was buried in Elva cemetery.