"Nothin' But a Good Time" (also known as "Nothing But a Good Time") is the first single from the hard rock/glam metal group Poison's second studio album Open Up and Say... Ahh!, with the band releasing that album in May 1988. B-sides "Livin' for the Minute" and "Look But You Can't Touch" were included in the single's release.

The song was released as a single in 1988 on Enigma Records and reached #6 on the Billboard Hot 100 and #19 on the Mainstream rock charts.^[5] It also charted at number 10 on the Australian charts and number 35 on the UK Singles chart.^[6]

The music video features a restaurant employee, played by the same actor who appeared in the video for Mötley Crüe's "You're All I Need", washing dishes while listening to the Kiss hit single "Rock and Roll All Nite", performed by Poison who recorded that for Less than Zero soundtrack in 1987. The manager is angry that he enters, turns off the radio, and delivers to the employee a scathing reprimand, reminding the employee that he is being paid "to wash dishes, not to listen to that... that rock 'n' roll," and accusing him of "moving in two speeds: slow, and stop." The manager exits, whereupon the employee abandons the dishes and kicks open a nearby door to reveal a concert hall stage, upon which the band then performs the song. When the song is over, the manager returns, discovering, to his surprise, that all the dishes are washed. It was played in heavy rotation on MTV in 1987.

"Nothin' But a Good Time" is widely regarded as one of Poison's best songs. In 2017, Billboard and OC Weekly ranked the song number nine and number four, respectively, on their lists of the ten greatest Poison tracks.^[7][8] Music critic Steve Huey of Allmusic has also stated that "Nothin' But a Good Time" became one of the bands "most widely recognized signature songs" as well as that parent album Open Up and Say... Ahh! wound up having "solidified the group's status as hair metal's top party band."^[9]

A 2007 Xbox commercial featured a cover version by a school choir.

"Nothin' But a Good Time" was performed by Poison, with the cast of Rock of Ages, at the 63rd Tony Awards on June 7, 2009. After the performance, as the band made their way backstage, a piece of the stage scenery collapsed on Bret Michaels.

The riff is similar to the opening riff from "Deuce" by Kiss.

It appears in a 2017 TV commercial for Nissan's Heisman House and ESPN, featuring Eddie George and other Heisman Trophy winners.

It also appears in a 2022 Direct Line television advert featuring Tessa Thompson in character as Valkyrie (Marvel Comics).^[10]

"Nothin' But a Good Time" is on the following albums:

• Open Up and Say...Ahh!
• Swallow This Live (live version)
• Poison's Greatest Hits: 1986–1996
• Power to the People (live version)
• Show Me Your Hits (Alternate version)
• The Best of Poison: 20 Years of Rock
• Open Up and Say... Ahh!
• Jammin' with Friends (feat. Ace Frehley, Michael Anthony) – 2 versions released as a singles

Reel Big Fish covered the song on their 2009 album Fame, Fortune and Fornication.

The song used in the movie The Rocker where it was covered by the fictional band A.D.D. The actual recording was mostly done by Chad Fischer with Teddy Geiger singing lead vocals. This version was released on the film's soundtrack album.

Adam Brand and the Outlaws covered the song on the 2016 album Adam Brand and the Outlaws.

• A cover of the song is featured in the game Guitar Hero Encore: Rocks the 80s (erroneously credited as "Ain't Nothin' But a Good Time"), while the master track is featured in Guitar Hero: Smash Hits (this time correctly credited) and was featured as a downloadable track for the Rock Band series.
• The NHL's Washington Capitals play this song after every home victory. ^{[citation needed]}
• In The Simpsons season 11 episode "It's a Mad, Mad, Mad, Mad Marge", Otto hires a Poison tribute band called Cyanide to play this song at his wedding. However, the band can only play the intro before Otto's fiancé, Becky, stops them.
• The song is featured in the trailers for the 2008 film Zack and Miri Make a Porno and Balls of Fury and the teaser trailer for the film Grown Ups 2.
• Professional wrestling tag team Dunn & Marcos, The Ring Crew Express, used the song as their entrance theme while in Ring of Honor.
• This song is played in the Cartoon Network animated series Regular Show in episode "My Mom" of season 2.^[19]
• The song is combined with "Sister Christian" by Night Ranger and "Just Like Paradise" by David Lee Roth in the 2012 film adaptation of Rock of Ages.
• "Nothin' But a Good Time" is available since October 14, 2014, as a purchasable and downloadable song for the music video game Rocksmith 2014, featuring guitar and bass parts as well as authentic tones.