La Molsosa is a municipality in the comarca of the Solsonès in Catalonia, Spain. It is situated in the south of the comarca in the Castelltallat range. It is linked to Calaf by a local road. The municipality is split into two parts, the bigger eastern part having nearly all the population. La Molsosa became part of the Solsonès in the comarcal revision of 1990: previously it formed part of the Anoia.