- O.W.C.A.
- O.W.C.A.'s Goin' Down
- O.W.C.A.-Traz
- O.W.C.A. (episode)
- O.W.C.A. (episode)/Transcript
- O.W.C.A. Files
- O.W.C.A. Files/Credits
- O.W.C.A. Files/Memorable Quotes
- O.W.C.A. Files/Transcript
- O.W.C.A. Files (song)
- O.W.C.A. Secret Headquarters
- O.W.C.A. agent beacons
- OWCA
- OWCA's Maximum Security Prison
- Obi-Wan Kenobi
- October
- Oddventure Land
- Off the Map
- Officer Concord the Juice Time Juice Box Flavor Cop
- Offscreen Lines
- Offscreen Lines/Last Day of Summer
- Offscreen Lines/Night of the Living Pharmacists
- Offscreen Lines/O.W.C.A. Files
- Offscreen Lines/Other
- Offscreen Lines/Phineas and Ferb: Mission Marvel
- Offscreen Lines/Phineas and Ferb: Star Wars
- Offscreen Lines/Phineas and Ferb Save Summer
- Offscreen Lines/Phineas and Ferb the Movie: Across the 2nd Dimension
- Offscreen Lines/Season 1
- Offscreen Lines/Season 2
- Offscreen Lines/Season 3
- Offscreen Lines/Season 4
- Oga
- Oh, Christmas Tree!
- Oh, Doofenshmirtz Evil Incorporated
- Oh, There You Are, Perry
- Oh, There You Are, Perry/Transcript
- Oh, There You Are, Perry and Swiss Family Phineas/Credits
- Ohio Flynn
- Oil on Candace
- Oil on Candace/Transcript
- Old Abandoned Amusement Park
- Old Coot
- Old Man Simmons
- Old Norm Head
- Old Timey Dimension
- Olga
- Olga and Chicago Joe
- Oliver Chris
- Olivia Olson
- On the Savannah
- On the Trail
- One-Track Amusement Park
- One Giant Marathon
- One Good Scare
- One Good Scare Ought to Do It!
- One Good Scare Ought to Do It!/Credits
- One Good Scare Ought to Do It!/Transcript
- One Good Turn
- One Good Turn/Transcript
- One Last Day of Summer
- Only Son
- Only Trying To Help
- Only Trying to Help
- Open Quantum Style
- Operation Crumb Cake
- Operation Crumb Cake/Transcript
- Operation Crumb Cake and Mandace/Credits
- Oppa Quantum Style
- Orange Moss
- Ordinary Day
- Oreste Canestrelli
- Organization Without a Cool Acronym
- Organization Without a Cool Acronym (2nd Dimension)
- Original Pitch
- Original Pitch/Transcript
- Original Story Pitch
- Orton Mahlson
- Orville Roddenstein
- Orville von Roddenstein
- Oscar and Michael's Phineas and Ferb Fan Club Show
- Otto H. Adjacent
- Our Song
- Out of Character
- Out of Toon
- Out of Toon/Transcript
- Out of Toon and Hail Doofania!/Credits
- Out to Launch
- Out to Launch/Credits
- Out to Launch/Transcript
- Owen Lars
- Owl (Agent)
- Owl (agent)
- Owner of Little Duffer's
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