Walter Morten Grunwald (9 December 1934 – 14 November 2018) was a Danish actor, stage director and theatre manager.

[2] In 1979, Grunwald succeeded Bent Meiding as manager of the Betty Nansen Theatre, a post he held until 1992.

From 1977, together with Peder Sadolin, his partner from Bristol Teatret, he was also a driving force behind the establishment of Østre Gasværk Teater in an abandoned gasometer.

[3] On 16 October 2018, the 83-year-old Grunwald informed Danish media that he had developed thyroid cancer, and that he only had months left to live.

Shortly before, he had cancelled an appearance at an event celebrating the 50th anniversary of the first Olsen Gang film, citing illness.