A block party or street party is a crowded party in which many members of a single community congregate, either to observe an event of some importance or simply for mutual enjoyment. The name comes from the form of the party, which often involves closing an entire city block to vehicle traffic. Many times, there will be a celebration in the form of playing music and dance and activities like pony rides, inflatable slides, pop corn machines and BBQs. Block parties gained popularity in the United States during the 1970s, particularly within the hip hop community. Block parties were often held outdoors and power for the DJ's sound system was taken illegally from street lights, as referenced in the song "South Bronx" by KRS-One.

Block Party!, released on September 7, 2013, is the 2013–2014 robotics competition for FIRST Tech Challenge. In the competition, two alliances, each consisting of two teams of high school students, compete to score blocks in plastic crates atop alliance-colored pendulums. Block Party! is the ninth FTC challenge.

Block Party may refer to:

• Block party, a neighbourhood festivity