The 2015 NBA Summer League consisted of three pro basketball leagues organized by the NBA: the Orlando Pro Summer League, Utah Jazz Summer League, and Las Vegas Summer League.

Ten teams participated in the week-long Orlando Pro Summer League at Amway Center in Orlando, Florida, from July 4 to 10, 2015. The Memphis Grizzlies won the Orlando Pro Summer League Championship over the Orlando Magic White team, 75–73, on a buzzer-beater floater by Russ Smith in double overtime. Aaron Gordon of the Orlando Magic was named the league's Most Valuable Player. The Miami Heat and Brooklyn Nets also participated in the Las Vegas Summer League.

The Utah Jazz Summer League was introduced for the first time in 2015, marking the first summer league to be played in Utah since the Rocky Mountain Revue was last held in 2008. Four teams participated in a round-robin format from July 6 to 9, 2015. No tournament was held, nor was there a champion named, but the Utah Jazz had the best record of the four teams, as they went undefeated with a 3–0 record. All four teams (Utah Jazz, Boston Celtics, Philadelphia 76ers, and San Antonio Spurs) also participated in the Las Vegas Summer League.

The Las Vegas NBA Summer League is the official summer league of the NBA. It is the premier summer league of the three, with a total of 23 teams, plus a Select Team from the NBA Development League, participating. A total of 67 games were played from July 10 to 20, 2015, across two different venues, the Thomas & Mack Center and Cox Pavilion, both located in Paradise, Nevada (near Las Vegas). The San Antonio Spurs won the championship by defeating the Phoenix Suns in the championship game, 93–90. Kyle Anderson was named the league's Most Valuable Player, with Jonathon Simmons of the Spurs being named the Championship Game MVP. The Spurs championship was historic, as they were coached by Becky Hammon, the first full-time female assistant coach in the NBA.

Each team played five games. Points were awarded to teams to determine the final standings. According to NBA.com the point system works like this: each game consists of eight possible points; four points for winning the game and one point for winning a quarter (in the event of a tied quarter, each team will receive 0.5 points). In the event of ties in seeding heading into championship day, three tiebreakers will be in place: 1) total point differential; 2) total points allowed; 3) coin flip.

Each team played one game on the league's final day for either first, third, fifth, seventh or ninth place.

The seeding was determined by a team's total points after the first five days. Eight points were awarded in each game: four points for winning a game and one point for every quarter a team won. In the event of a tied quarter, each team is awarded half a point. If two or more teams had equal points, then the following tiebreakers applied:

Each odd-numbered seed was paired with the team seeded immediately below it. For example, the top two seeds played in the championship game, the third and fourth seeds played in the third-place game, etc.