Ligat HaAl (Hebrew: ליגת העל, lit., Supreme League or Premier League), or the Israeli Basketball Premier League, is a professional basketball league in Israel and the highest level of basketball in the country. The league's name is abbreviated as either BSL (Basketball Super League) or ISBL (Israeli Basketball Super League). For sponsorship reasons, the league is also referred to as Ligat Winner Sal (Hebrew: ליגת ווינר סל), lit. Winner Basket League, with "Winner" being the name of a game operated by the league's primary sponsor, Toto Winner.

The league is run by the Israeli Basketball Super League Administration Ltd.

Ligat HaAl comprises the top 12 basketball clubs in Israel, and was founded in 1954.

The league itself is most known in Europe, due to the success of the Israeli teams in European-wide competitions, such as the EuroLeague, EuroCup (formerly called the ULEB Cup), and FIBA's EuroChallenge (formerly called the FIBA EuroCup). Many non-drafted and free agent players from Europe and the NBA play in the Israeli league, as an alternative to NBA competition.

The league is the first division in Israeli basketball: the team that finishes last in a season is relegated to the Second Division, while the Second Division's top eight teams compete in a play-off system right after the end of the regular season, with the team that reaches the finals series being promoted to the Premier League for the following season.

There are 14 teams in the league, and they play against each other three times a season. The top eight teams advance to the five-game series Quarter-finals. The winners of the Quarter-finals advance to the Final Four.

In the 1980s and the early 1990s, the Israeli League stars played in Israel against the Phoenix Suns, Cleveland Cavaliers, Orlando Magic, and Los Angeles Lakers.

In October 2005, Maccabi Tel Aviv defeated the Toronto Raptors 105–103 in an exhibition game played in Toronto, Canada; this was the first victory for any European or Israeli team over an NBA team on its home court.