P13, P-13 or P.13 may refer to:

A stereotypical cat lady, or cat woman, is a singlewoman who dotes upon her cat or cats. The term is usually considered pejorative, though it is sometimes embraced.

At least in the Anglosphere, single women who own cats have long been associated with the concept of spinsterhood. In more recent decades, the concept of a cat lady has been associated with "romance-challenged (often career-oriented) women who can't find a man".

The term is also used to denote an animal hoarder who keeps large numbers of cats without having the ability to properly house or care for them. They may be ignorant about their situation.

The 2009 documentary Cat Ladies tells the stories of four women whose lives have become dedicated to their cats. The film was directed by Christie Callan-Jones and produced by Chocolate Box Entertainment, originally for TVOntario. It was an official selection at the 2009 Hot Docs Festival, Silverdocs Festival, and San Francisco's DocFest.

Naftali Berrill, Ph.D., Director of the New York Center for Neuropsychology and Forensic Behavioral Science told AOL Health, "These may be people who have a very hard time expressing themselves to other people. They may find the human need for affection is met most easily through a relationship with a pet." This devotion can sometimes signal mental or emotional issues such as depression.