TV The Best Seasons of It's Always Sunny in Philadelphia  

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List Rules Rank the seasons of It's Always Sunny in Philadelphia based on quality.

This list of the best seasons of It's Always Sunny in Philadelphia is listed from best to worst with DVD cover pictures when available. IASIP fans will also enjoy Mac's most bicurious moments and insane fan theories about the show. Hardcore fans of the show often argue over what the greatest season of It's Always Sunny in Philadelphia is, which is exactly why this ranked list was created. The best Always Sunny episodes and the top 10 Always Sunny episodes are all a part of the best seasons of Its Always Sunny in Philadelphia. 

It's Always Sunny in Philadelphia is arguably one of the most hilarious situational comedies on television today. The show follows the lives of "The Gang," a group of self-centered, underachiever friends who run an Irish pub in South Philly. Starring Danny DeVito, Charlie Day, Rob McElhenney, Kaitlin Olson, and Glenn Howard, it's nearly impossible to pick which season of It's Always Sunny is truly the best.  

Every season of It's Always Sunny in Philadelphia has at least one memorable episode, so it isn't necessarily easy to figure out what the top season is. If you want to answer the questions, "What is the best season of It's Always Sunny in Philadelphia?" and "Which season of It's Always Sunny in Philadelphia is the best?" then this list will have you covered. Vote up the best seasons of It's Always Sunny in Philadelphia below, and be sure to let us know what you think in the comment section. 

It's Always Sunny in Philadelp... is listed (or ranked) 1 on the list The Best Seasons of It's Always Sunny in Philadelphia
Photo:  FX

The third season of It's Always Sunny in Philadelphia premiered on September 13, 2007 and contains 15 episodes. This season finds the gang facing problems with the law and their enemies, the McPoyles.

This season features several unforgettable episodes including: "Sweet Dee's Dating a Retarded Person," "Mac is a Serial Killer," and "The Gang Dances Their Asses Off."

Memorable moments from Season 3 include:

- Charlie and Dennis perform "Dayman".
- Dennis and Charlie face off in a dance competition.
- Mac is reunited with his father.
It's Always Sunny in Philadelp... is listed (or ranked) 2 on the list The Best Seasons of It's Always Sunny in Philadelphia
Photo:  FX

The fourth season of It's Always Sunny in Philadelphia premiered on September 18, 2008 and contains 13 episodes. This season finds the gang scheming and hatching plans to gain money and power.

This season features several unforgettable episodes including: "Dennis Reynolds: An Erotic Life," "Paddy's Pub: The Worst Bar in Philadelphia," and "The Nightman Cometh."

Memorable moments from Season 4 include:

- Charlie puts on his play "The Nightman Cometh".
- Dennis meets Sinbad and Rob Thomas in rehab.
- Frank and Charlie find poop in their bed.
It's Always Sunny in Philadelp... is listed (or ranked) 3 on the list The Best Seasons of It's Always Sunny in Philadelphia
Photo:  FX

The seventh season of It's Always Sunny in Philadelphia premiered on September 15, 2011 and contains 13 episodes. This season finds Mac struggling with weight gain.

This season features several unforgettable episodes including: "Frank Reynolds’ Little Beauties," "Chardee MacDennis: The Game of Games," and "How Mac Got Fat."

Memorable moments from Season 7 include:

- Kings of Leon attend the gang's high school reunion.
- Frank hosts a beauty pageant for young girls.
- Dee fakes a baby funeral.
It's Always Sunny in Philadelp... is listed (or ranked) 4 on the list The Best Seasons of It's Always Sunny in Philadelphia
Photo:  FX

The fifth season of It's Always Sunny in Philadelphia premiered on September 17, 2009 and contains 12 episodes. This season finds the gang attempting to benefit from the recession.

This season features several unforgettable episodes including: "The Gang Gives Frank an Intervention," "The Waitress Is Getting Married," and "Mac and Charlie Write a Movie."

Memorable moments from Season 5 include:

- The gang drinks wine out of soda cans.
- Frank becomes the "Trash Man".
- The gang tries to create a Shyamalan twist.