But Not in Vain (Dutch name Niet Tevergeefs) is a 1948 Anglo-Dutch World War II drama, directed by Edmond T. Gréville and starring Raymond Lovell.

In late 1944, the Hongerwinter famine is starting to bite in the occupied northern and western Netherlands and Nazi persecution is rife.

With the help of his daughter Elly, Alting is currently providing shelter for Jewish couple Mark and Mary Meyer; van Nespen, an aristocrat with active links to the underground movement, and Bakker, a Communist wanted by the Germans for sabotage.

The film's name is derived from a wartime radio speech by the exiled Queen Wilhelmina of the Netherlands, exhorting her people to resist the Nazi occupation and promising that their struggle and sacrifice would not be in vain.

But Not in Vain was first screened in December 1948; however surviving contemporary reviews all date from early 1950, leading to the assumption that a general release was delayed until then for unknown reasons.