1931 Čapek, provisional designation 1969 QB, is a main belt asteroid, discovered on 22 August 1969, by Luboš Kohoutek at Bergedorf Observatory in Germany. The dark carbonaceous C-type asteroid has an eccentricity of 0.27 and an orbital period of 1,476 days or 4.05 years. This asteroid is named in memory of Karel Čapek (1890–1938), Czech dramatist and novelist, best known for his allegorical plays R.U.R. and Krakatit, in which he anticipated both, the destructive potential of nuclear physics and their moral implications.