Karin Margareta Wilhelmson, née Nordh (born January 4, 1933 in Nyköping; died August 12, 2018 in Stockholm) was a Swedish journalist and radio producer.
Wilhelmson worked as a daily press journalist from 1950, since 1960 as a producer at Sveriges Radio.
She was a member of TV1's program council from 1973 to 1978.
Together with Monica Boëthius and Birgitta Rembe, she was a member of the Family Mirror in the 1960s.
Wilhelmson led the Sommar radio program on August 22, 1968 and August 6, 1970.