Ninja Sex Party (often abbreviated as NSP) is an American musical comedy duo consisting of singer/bassist Dan Avidan and keyboardist Brian Wecht. They formed in 2009 in New York City and are currently based in Los Angeles. They are also known as two thirds of the video game-based musical trio Starbomb, together with frequent collaborator Arin Hanson. Avidan joined Hanson's YouTube Let's Play webseries Game Grumps as co-host in 2013.
The work of Ninja Sex Party typically consists of rock or synth-pop-oriented humorous songs, frequently on the topics of sex, seduction, love or fantasy, with Avidan and Wecht respectively portraying the characters of Danny Sexbang, an idiotic, exuberant, hypersexual Jewish man constantly trying to hit on women, and Ninja Brian, an uncommunicative, homicidal ninja with Erectile Disfunction. However, their Under the Covers cover album series that started in 2016 saw them take on a non-comedic approach to music for the first time, covering songs from the 1970s and 1980s.
To date, NSP has released eight studio albums (five consisting of original material, and three cover albums), in addition to three albums as a part of Starbomb. Wecht initially acted as record producer and performed all instruments on their early albums, until they started working with producer Jim Arsenault (and later Jim Roach) and backing band TWRP in 2015. Wecht and Avidan have appeared in Tupper Ware Remix Party's own works, either as individuals or as Ninja Sex Party. Since May 2018, Wecht also portrays Ninja Brian on his own live comedy show titled Ninja Brian's All-Star Variety Luau Spectacular.