You're Not My Motherby Transformersfan555
Linda Flynn has never been Ferb's mother, and she never will be.
Perry the Teenage Spy: Rewriting t...by PopcornFairy28
17 year-old Perry Fletcher struggles with balance between his family and his secret agent job that they still don't know about during a hectic summer, but little does he...
Steampunx Vigilantes ( A Phineas A...by Crossover Author
Takes place after the episode Steampunx. The timeline is set to 1909(few years after the episode), at the World's Fair(outside of Danville), where the "Modern Steam...
The Little Flynn-Fletcher by Just_Husker
Liv Fletcher is Ferb's little sister and Phineas and Candace's little stepsister. After the divorce with her biological mother, she gave Liv to Lawrence.
The best part of summer (Phineas F...by SupergirlDY2
When you move from your familiar home to suburban Danville, you didn't expect your summer to be much different or more exciting than it usually is. But over 104 days of...
Phinbella: The Rejectionby Monice Beaks UK
Isabella gets hit with an anger ray from Doofenshmirtz Evil Inc. Meanwhile, Phineas's friends finally tell him about Isabella's feelings for him, Fortunately, This isn't...
Completed
Kenshi (Phineas and Ferb OC) Seaso...by Eixheir
The series introduces three step-brothers on summer vacation trying to make every day the best day ever, while their sister tries to bust them. The six main characters a...
War & Reeseby AuthorA97
She's 71 now. How did that happen? She's growing up so fast. The only solution is come to a world of endless summer and hope it's all sunshine and rainbows. (Morgan's ne...
Phineas and Ferb: Diary of a Ferb...by KevinAtTheDisco
A "Phineas and Ferb" x "The Future Diary" crossover story.
Completed
Take Two With Phineas and Ferb: Jo...by VioletRose13
Phineas and Ferb have a interview with the one and only Johnny Depp.
Completed
When Worlds Collide 《Ferbnessa》by Shadow Figure
When sixteen year old Vanessa Doofenshmirtz takes a job babysitting her friend Candace's younger brothers Phineas and Ferb, she has no idea of the adventure that she's g...
Forbidden Love ❤️ by amada
My friend sent an image of Phineas making out with Oikawa in a discord server i'm in so I thought "ok i'll write a shitty fanfic" anyways enjoy.
Into The Mysterious Forceby NaLu_Crazy_Fan
School year was over and a new summer is here. Phineas and Ferb can't wait to make the best of it. But the appearance of some DVD's has put their plans on hold. What old...
The Secret Noteby InEveryUniverse
Phineas has been given the opportunity of a lifetime! But, he can't tell anyone...not his friends, family, or even Ferb. At least he doesn't have to deal with any other...
Ferb Supremacy Cultby A Literal Corgi
Members of the Ferb Supremacy Cult believe in Our Lord Ferb Fletcher, the superior Flynn-Fletcher stepbro.
Okay Then, Just One Questionby GalaxyRose1996
During the end of their interdimensional adventure of the day, Isabella chooses to kiss Phineas, knowing that everyone, herself included, will forget the day's events. O...
Completed
Hira and Haily Meet Phineas and Fe...by Kirsten A. Palacio
Hira and Haily Went To Danville To Spend Summer With Phineas and Ferb, Since Hira Is Still a Orphan She Has To Stay At The Flynn-Fletcher Household, While Haily Stays At...
Hira And a Phineas and Ferb Christ...by Kirsten A. Palacio
It Is Christmas Time In Danville And Hira Is Having a Hard Time Due To Her Breakup With Jumbo (Who's a Monster), However Josh Finds This As a Chance To Get Together With...
Built for Loveby Adrian
A simple tale of love and appreciation. I will update when I can as I continue to live my day-to-day...
Credit to sunsh1ne1023 for the title name!
Disclaimer: I, of cour...
Completed