Ninja Sex Party (often shortened to NSP) is an American musical comedy duo consisting of singer Dan Avidan and keyboardist Brian Wecht, created in 2009 in New York City and currently based in Los Angeles. They are also known as two thirds of the video game-based parody musical trio Starbomb together with frequent collaborator Arin Hanson, and as a part of the YouTube Let's Play webseries Game Grumps, also with Hanson.

The work of Ninja Sex Party typically consists of synthpop or rock-oriented humorous songs, frequently on the topics of sex, seduction, love, or fantasy, with Avidan and Wecht portraying the characters of Danny Sexbang, an idiotic, exuberant, and strangely-dressed hypersexual Jew, and Ninja Brian, an uncommunicative, homicidal ninja; however, their 2016 cover album, Under the Covers, saw them take on serious music for the first time. To date, NSP has released four studio albums, in addition to two albums as a part of Starbomb, while also releasing original, non-musical material on their YouTube channel. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.