Okojo-san (オコジョさん) is a Japanese manga series written and illustrated by Ayumi Uno and serialized in LaLa.

Okojo-san was adapted into a 51-episode anime series titled Okojo's Happy Apartment (しあわせソウのオコジョさん, Shiawase Sou no Okojo-san) by the Japanese animation studio Radix Ace Entertainment, and aired on TV Tokyo from October 2, 2001 to September 24, 2002.

A white ermine, Okojo-san lives at an exotic pet store run by a greedy manager until one day he escapes.

In the chaos following, he ends up unconscious in a garbage can, where college student Haruka Tsuchiya finds him.

At the Shiawase apartment complex, Okojo meets other pets, including the gerbil Chorori, and the various eccentric human tenants.