Jeux sans frontières (pronounced [ʒø sɑ̃ fʁɔ̃tjɛʁ]; "Games Without Borders" in French) is an international television competition organised by the European Broadcasting Union (EBU) for thirty seasons, from 1965 to 1999, between members of the union who participated representing their countries. Broadcasters sent mixed teams that competed against each other in a series of games, usually funny physical games played in outlandish costumes though none-the-less technically difficult, with the most successful teams of the season from each country competing in a grand final. Each episode was hosted by one of the participating broadcasters at a location in its country and was themed around a specific topic.

The show was created for the EBU by Guy Lux and Claude Savarit from the Office de Radiodiffusion Télévision Française (ORTF) as an international version of their own show Intervilles, which was first broadcast in 1962 in France. In non-French-speaking countries, Jeux sans frontières has alternative titles in the corresponding local languages. It is also widely known in English as It's a Knockout, the title of the BBC's domestic version that was its national selection for the international competition. The show spawned a winter version held in ski resorts, and single-episode Christmas specials.