In linguistics, the pegative case (abbreviated peg) is a hypothetical grammatical case that prototypically marks the agent of an action of giving.

The case has been posited by Danish linguist Søren Wichmann for the Azoyú variety of the Tlapanec language, which seems to be the only natural language to use such a case. Wichmann writes that he has:

• Wichmann, Søren (2005). "Tlapanec Cases" (PDF). In Rosemary Beam de Azcona; Mary Paster (eds.). Report 13, Survey of California and Other Indian Languages. Conference on Otomanguean and Oaxacan Languages, March 19–21, 2004. Berkeley CA: University of California at Berkeley. pp. 133–145. Archived from the original on November 2, 2014. Retrieved 2011-03-01.