Season 4

The Fourth Season of Phineas and Ferb was officially announced on August 25, 2011. It had been renewed as part of a multi-year, multi-million dollar deal between creators Dan Povenmire, Jeff "Swampy" Marsh, and Disney. On November 9, 2011, it was announced that the fourth season will pick up with new episodes rolling out through 2014.

The season started with "For Your Ice Only", a winter-themed sports episode and "Happy New Year!", a celebration of New Years Day on December 7, 2012 on Disney Channel US and December 31, 2012 on Disney XD.

Some celebrity guests include Luc Robitaille, Samantha Bee, Jaime Pressly, Parry Gripp, Wayne Brady, Kelly Osbourne, Maia Mitchell, Simon Baker, Goldie Hawn, Elizabeth Banks, Leah Remini , Simon Pegg, Billy Gardell , Chef Gordon Ramsay  and Gravity Falls creator/executive producer Alex Hirsch.

Other episodes include "Sidetracked" and "Primal Perry", a commemoration of Platypus Day, a musical featuring the one-hit wonder Phineas and the Ferb-Tones, an episode that succeeds the events of Phineas and Ferb The Movie: Across the 2nd Dimension along with a crossover episode featuring the Marvel Universe and one that will feature a Star Wars crossover.

On February 15, 2014, it was announced that the season was completed and the show will take an indefinite hiatus.

Title sequence changes from Season 3
The title sequence remains the same, but images from Phineas and Ferb The Movie: Across the 2nd Dimension, "Doof Dynasty", "Moon Farm", "The Remains of the Platypus", "Escape from Phineas Tower", "Tri-Stone Area", "Excaliferb", and "Bully Bromance Breakup" replace the ones from Season 2.

Episodes
In the table below, the following abbreviations are used: DXD = Disney XD; DC US = Disney Channel US; Ep. # = Episode number; Vol. # = Volume number (shown in the iTunes Store as a "season").