Ace Ventura: When Nature Calls (also known as Ace Ventura 2: When Nature Calls) is a 1995 American detective comedy film and the sequel to Ace Ventura: Pet Detective (1994), and the second installment of the Ace Ventura franchise. Jim Carrey reprises his role as the title character Ace Ventura, a detective who specializes in retrieval of tame and captive animals, and has been summoned to Africa to locate a missing bat. Ian McNeice, Simon Callow, and Sophie Okonedo co-star. Tommy Davidson, who co-starred with Carrey on the show In Living Color, makes a cameo appearance in the film.

The film was written and directed by Carrey's close friend Steve Oedekerk, who had also collaborated in the production and as a character consultant for the first film.

The film was produced by Morgan Creek Entertainment and was released on November 10, 1995 by Warner Bros., but unlike the previous installment, it received mainly negative reviews from critics, despite being financially successful, earning a total of $212.4 million at the box office against a budget of $30 million.