Season 0 of It's Always Sunny in Philadelphia premiered on 2007-09-04.

Season 1

7.8

.

2005

.

7 Episodes

Season 1 of It's Always Sunny in Philadelphia premiered on 2005-08-03.

Season 2

8.3

.

2006

.

10 Episodes

Season 2 of It's Always Sunny in Philadelphia premiered on 2006-06-28.

Season 3

8.3

.

2007

.

15 Episodes

Season 3 of It's Always Sunny in Philadelphia premiered on 2007-09-12.

Season 4

8.4

.

2008

.

13 Episodes

Season 4 of It's Always Sunny in Philadelphia premiered on 2008-09-17.

Season 5

8.3

.

2009

.

12 Episodes

Season 5 of It's Always Sunny in Philadelphia premiered on 2009-09-16.

Season 6

8

.

2010

.

13 Episodes

Season 6 of It's Always Sunny in Philadelphia premiered on 2010-09-15.

Season 7

7.9

.

2011

.

13 Episodes

Season 7 of It's Always Sunny in Philadelphia premiered on 2011-09-14.

Season 8

8.2

.

2012

.

10 Episodes

Season 8 of It's Always Sunny in Philadelphia premiered on 2012-10-09.

Season 9

8

.

2013

.

10 Episodes

Season 9 of It's Always Sunny in Philadelphia premiered on 2013-09-02.

Season 10

8.1

.

2015

.

10 Episodes

Season 10 of It's Always Sunny in Philadelphia premiered on 2015-01-12.

Season 11

7.8

.

2016

.

10 Episodes

Season 11 of It's Always Sunny in Philadelphia premiered on 2016-01-04.

Season 12

7.9

.

2017

.

10 Episodes

In season twelve, Mac, Dennis, Charlie, Dee and Frank tackle all new adventures that include going to a waterpark, dealing with a Wolf Cola PR nightmare, and actually spending a whole day tending bar!

Season 13

7.4

.

2018

.

10 Episodes

The Gang returns... mostly... in Season 13. Mac, Charlie, Dee, and Frank return to their duplicitous, scheming ways at Paddy’s Pub, while Dennis takes on the new role of father in North Dakota. Even without Dennis, the Gang has its hands full as Charlie hopes to have a child with The Waitress, Mac sets out to understand his newfound sexuality, Dee takes feminism to new heights, and Frank goes to great lengths for the Gang to experience the greatest moment in Philadelphia sports history – an Eagles Super Bowl victory.

Season 14

7.5

.

2019

.

10 Episodes

The 14th season guns for the Best 14th Season accolade as the Gang goes to extremes for the role – Mac learns a new language, Charlie does a period piece, Dennis attempts a one-act play, Dee cuts her hair, and Frank performs a death scene.

Season 15

7.5

.

2021

.

8 Episodes

In season fifteen, the gang finds themselves at a crossroads in this strange new world in the wake of Covid-19 and all things 2020. The rules are changing quicker than anyone can keep up with, despite herculean efforts from Mac, Charlie, Dennis, Dee, and Frank to continue business as usual. They must also now face the music and decide who they’ll become in the cultural upheaval that is 2021.

Season 16

8.2

.

2023

.

8 Episodes

In Season sixteen, it’s a challenge for Ronald "Mac" MacDonald, Charlie Kelly, Dennis Reynolds, Dee Reynolds, and Frank Reynolds who yearn for the past as they attempt to survive in 2023. This year alone, Mac battles with allergies and long-distance dating, Charlie takes on his long-forgotten sisters, Dee fights for rent control and women's athletics, Frank wrestles for his gun, and Dennis struggles to improve his mental health. At the end of the day, they're navigating 2023 with 16 years of baggage as a few figures from their past rear their heads.

Season 17

7.6

.

2025

.

8 Episodes

In Season 17 of It's Always Sunny in Philadelphia, the Gang craves money and parasitic social privileges. That's been plain since 2005. But they're also human beings.