- "The Responsible": Anais takes a bath here.
- "The Prank": Gumball and Darwin hide from Richard here.
- "The Gi": Gumball and Darwin brush their teeth here.
- "The Secret": Gumball and Darwin arrive here after their adventure through the sewers.
- "The Wand": A similar bathroom appears during Richard's series of flashbacks.
- "The Curse": Gumball takes a shower and ends up falling into the toilet.
- "The Knights": Richard showers and is thrown out when Gumball tries to brush his teeth with soap.
- "The Flakers": Gumball puts a poster of his mom being angry onto the bathroom mirror.
- "The Authority": Richard is seen showering, and is interrupted by Nicole and Granny Jojo.
- "The Hero": Gumball and Darwin try to take a shower, but are rejected by Anais.
- "The Tag": Richard takes a bath of melted cheese.
- "The Voice": It is indirectly mentioned as the place where Gumball, Darwin, Anais, and Richard brush their teeth.
- "The Internet": Gumball and Darwin notice multiple living bathroom furniture.
- "The World": Richard is seen brushing his teeth.
- "The Kids": Gumball and Darwin make fun of their parents here.
- "The Coach": Gumball and Darwin fail to brush their teeth because their mouths were wide open.
- "The Password": Gumball and Darwin give their father a bath.
- "The Procrastinators": Gumball and Darwin try on make up, and later make their own music.
- "The Burden": Gumball and Darwin bathe with Principal Brown's hair, which they believe is Chris Morris.
- "The Mirror": Richard lands here after The Snatcher's curse is removed.
- "The Man": Richard and Louie perform "man washing."
- "The Lie": Gumball and Anais come here after delivering presents right before Miss Simian arrives.
- "The Countdown": Darwin prepares for his day.
- "The Nobody": Gumball and Darwin are seen here searching for the culprit.
- "The Downer": Gumball flushes down a lego piece, and later takes a shower.
- "The Money": The Wattersons are seen using it.
- "The Crew": Gumball and Darwin try to look old here.
- "The Signature": Multiple furniture is seen collapsing.
- "The Origins": Richard bathes in soda, and later flushes several fish down the toilet. The family is also seen in the bathroom near the end of the episode.
- "The Signal": Gumball puts a bandage on Darwin's head and tries to cheer him up.
- "The Night": Daisy the Donkey gives Anais a bath in the former's dream.
- "The Misunderstandings": Gumball takes a shower while talking with Penny on the phone.
- "The Detective": Daisy's stuffing leads Anais to investigate the room.
- "The Copycats": Richard chains himself up and lays in the bathtub.
- "The Outside": Frankie and Richard take a shower.
- "The Matchmaker" (flashback)
- "The Diet": Gumball and Darwin find a slice of cheese hidden by Richard.
- "The Uncle": Gumball brushes his eyes.
- "The Singing": Nicole angrily walks in when a singing showerhead wakes her up.
- "The Deal": Richard gives the kids a bath.
- "The Puppets": Darwin continues using Frank and Howdy here.
- "The Rival": Anais sets Gumball's bathwater to hot and causes it all to evaporate.
- "The Anybody": Gumball turns off an alarm clock that has been beeping.
- "The Slip": Richard takes a bath here when the doorbell rings.
- In "The Promise," there is a window in place of the mirror.
- In seasons 1 and 2, the door of the bathroom seems to be opposite the bathtub, but starting with Season 3, the door is to the right of the bath.