"House of Bloo's" is the collective name for the first three episodes of the animated television series Foster's Home for Imaginary Friends. The episode's plot follows Mac, an eight-year-old boy who is pressured by his mother to abandon his imaginary friend Blooregard Q. Kazoo, on the grounds that he is too old for him. Upon seeing an ad on television for an orphanage for imaginary friends, Bloo convinces Mac to let him reside in the house so then Mac can visit him every day. Various intrigues and troubles arise with Mac's brother Terrence and imaginary friend Duchess.

It premiered on Cartoon Network on August 13, 2004. The episode was written and directed by the show's creator Craig McCracken, with further story work by his then-fiancée Lauren Faust and screenwriters Craig Lewis and Amy Keating Rogers. The episode debuted to positive reviews and high ratings.