Sour grapes may refer to:
- An expression originating from "The Fox and the Grapes," one of Aesop's Fables. It refers to making a false pretense to form a Rationalization, i.e., not to care for something one wants, but does not or cannot have.
- An allusion to the line in Jeremiah (31:29) and Ezekiel (18:2) (KJV): "The fathers have eaten sour grapes, and the children's teeth are set on edge."
- Sour Grapes (book), a book of poems by William Carlos Williams
- Sour Grapes: Studies in the Subversion of Rationality (Cambridge, 1983), a book by Jon Elster describing the phenomenon of adaptive preference formation
- Sour Grapes, a character from the "Strawberry Shortcake" series
- Sour Grapes (film), a 1998 film written and directed by Larry David
- Happy Hour, a 1987 film also known as Sour Grapes