McDull, Prince de la Bun (Chinese: 麥兜菠蘿油王子, literal title: McDull, the prince of the Pineapple bun with butter) is a 2004 Hong Kong animated comedy-drama film directed by Toe Yuen and starring the voices of Andy Lau, Sandra Ng and Anthony Wong. Telling the story of the life of the fictional pig McDull, it is a sequel to My Life as McDull (2001) and it was followed by McDull, the Alumni (2006).

There is significant word play in the film, some of it based on the "pineapple bun". For example, in slang Cantonese, a "bor lo goi" ("pineapple cap") is a colloquialism for kneecap. The Pancakes, who composed the film's theme song gum gum gum (Cantonese: 咁咁咁, literally "this, this, this"), was awarded Best Original Film Song in the 24th Hong Kong Film Awards.