Hans Harald "Hasse" Zetterström (23 May 1877 – 1 June 1946) was a Swedish author, columnist and editor Hasse was born 23 May 1877 in Stockholm, Sweden, to father August Zetterström and mother Elisabet Zetterström (née Carlberg).

As editor he commissioned the creation of the satirical magazine Grönköpings Veckoblad, detailing the fictional Swedish town of Grönköping.

Hasse also began contributing a regular column in 1931 to major national Swedish newspaper Svenska Dagbladet.

Erik became a notable journalist and columnist for Svenska Dagbladet under the pseudonym of Kar de Mumma whilst Sven was a screenwriter and journalist.

This article about a Swedish writer or poet is a stub.