Mr. Blandings Builds His Dream House is a 1948 American comedy film directed by H. C. Potter, and starring Cary Grant, Myrna Loy and Melvyn Douglas. Written and produced by the team of Melvin Frank and Norman Panama, it was an adaptation of the 1946 novel of the same name written by Eric Hodgins and illustrated by William Steig.

The movie was the third and last pairing of Grant and Loy, who had shared a comfortable chemistry in The Bachelor and the Bobby-Soxer (1947) and Wings in the Dark (1935).

It was a box office hit upon its release. Warner Home Video released it to DVD with restored and remastered audio and video in 2004. It was loosely remade in 1986 as The Money Pit, starring Tom Hanks and Shelley Long, and in 2007 as Are We Done Yet?, starring Ice Cube.