Mickey's Surprise Party is a 1939 American animated short film directed by Hamilton Luske, produced by Walt Disney Productions and distributed by National Biscuit Company. It was the 105th short in the Mickey Mouse film series to be released, and the second for that year. Mickey's Surprise Party is the first cartoon with Mickey and Minnie Mouse in their current designs, created by animator Fred Moore.

This is notable for being the first Disney product of any kind to be sponsored by a company. Commonly thought to be in the public domain, its copyright was renewed on May 2, 1966. Walt Disney hated the idea of public commercials, and avoided commercial entanglements until then. The cartoon had its premiere at the Golden Gate International Exposition (GGIE) on Treasure Island in San Francisco in February 1939. The film was shown in the "Food and Beverages" building in the Nabisco Theater. Walt was present at the fair for the premiere of the short. It was also shown in the Nabisco Theater at the New York World's Fair in 1939, which did not open until April. The two versions were identical except that the National Biscuit Company products (cookies and crackers) featured at the end were different, reflecting products available on the west and east coasts.

In the short, Pluto's romantic partner is Fifi, a Pekingese who also appears in Puppy Love (1933), Pluto's Quin-puplets (1937) and Society Dog Show (1939).