Beitar Jerusalem Football Club (Hebrew: מועדון כדורגל בית"ר ירושלים, romanized: Moadon Kaduregel Beitar Yerushalayim), commonly known as Beitar Jerusalem (Hebrew: בית"ר ירושלים, romanized: Beitar Yerushalayim) or simply Beitar (בית"ר), is an Israeli professional football club based in the city of Jerusalem, that plays in the Israeli Premier League, the top tier in Israeli football. The club has traditionally worn kit colours of yellow and black and plays its home matches in Teddy Stadium. The stadium is the largest stadium in Israel, with a capacity of 31,733.

The club is one of the most popular in Israel and is among the Israeli clubs with the highest number of fans in the country. The club was founded in 1936 by Shmuel Kirschstein and David Horn, who chaired the Betar branch in Jerusalem. Several team members were also part of the outlawed Irgun and Lehi militias closely associated with the right-wing Revisionist Zionism movement. Beitar's fans have become a highly controversial political symbol in Israeli football culture, unofficially aligning with the Revisionist Zionist movement and Likud party. Beitar is the only club in the Israel Premier League to have never signed an Arab player and the fanbase is notorious for its anti-Arab racism and anti-Muslim religious bigotry. Notably, the club has previously signed four non-Arab Muslim players.

Domestically, Beitar has won the Israeli Premier League six times, in 1986–87, 1992–93, 1996–97, 1997–98, 2006–07, and 2007–08; the Israeli Cup eight times, in 1975–76, 1978–79, 1984–85, 1985–86, 1988–89, 2007–08, 2008–09, 2022–23; and Israeli Supercups twice in 1976 and 1986.

Beitar Jerusalem was founded in 1936 by Shmuel Kirschstein and David Horn as a youth team. The first games were held against Armenian and Arab teams in Jerusalem, though Hapoel Jerusalem boycotted for political reasons. In 1942, a match was held at Tel Aviv's Maccabiah Stadium between Beitar and the Islamic Sports Club of Haifa. Beitar won 5–1. At the end of 1943 and early 1944, Beitar played several games against the club from Katamon, Al-Dajani, the city's leading Arab team.

Later, Beitar Jerusalem qualified for the final, which was to be held against the team of the "Paymasters" of the British mandate. The fans of rival Hapoel Jerusalem disrupted the game, and the "Jerusalem Cup remained in the hands of the politicians in Tel Aviv."

On 19 October 1944, several club players were among 251 persons who were deported to Eritrea, Kenya, and Sudan by the British Mandate authorities. Among the deportees were David Horn and Rabinovich and some members of Beitar Jerusalem's "First team of 1936." A Beitar Jerusalem team was set up in Gilgil, where many deportees played in city-of-origin-based teams. A plan was made to dig a tunnel from the centre of a football pitch in the detention camp in Kenya. Two of the deportees were murdered by Sudanese guards for an alleged "escape attempt". Six succeeded in reaching Europe. All living deportees reached Israel in July 1948.

When a joint team of Beitar Jerusalem and Beitar Tel Aviv visited Lebanon and Syria, they played against Homenetmen, an Armenian team, which ended in 0–0, and the French Army team, in which Beitar lost 2–5. Both games were held in Beirut. Another game, planned in Aleppo, was cancelled because of a diplomatic incident as Arab delegates in the hotel protested seeing an "Eretz Yisrael" flag, now the Israeli flag, in an Arab country. The British ambassador intervened, suggesting that the Union Jack be raised instead of the "Eretz Yisrael" flag, but the head of delegation Hayyim Levin opposed. Due to the impasse, the game was canceled. Simon Alfasi, Shimon Stern, Yisrael Yehezqel, and goalkeeper Yosef Meyuhas were the Beitar Jerusalem players on the trip.

In 1946, Beitar Jerusalem qualified for the 2nd round of the Cup Games against Maccabi Tel Aviv. The scores were a 3–3 and a loss 3–2 in game 2. Simon Alfasi scored all five goals for the club, three in the first and two in the second.