Benjamin Roy "B. J." Armstrong Jr. (born September 9, 1967) is an American retired professional basketball player. Armstrong won three NBA championships during his career as a point guard for the Chicago Bulls.

Armstrong was born in Detroit, Michigan and attended Brother Rice High School in Bloomfield Township, Michigan. He graduated in 1985.

Armstrong had an illustrious career at the University of Iowa as the Hawkeyes' all-time leader in assists with 517 upon graduation; and is currently ranked fourth all-time. He also ranked sixth on the school's all-time steals list (178) and fourth in total points (1,705). The 6-foot-2 guard shot .443 (136-of-307) from three-point range over his four-year career and averaged 18.6 points and 5.4 assists as a senior. Armstrong received his bachelor's degree from Iowa in May 1989.

Selected by the Chicago Bulls in the first round of the 1989 NBA draft, the 6'2" (1.88 m) Armstrong helped the team return to the Eastern Conference Finals after compiling 55 regular season victories in 1990.

In 1991, he helped them win their first NBA title against the Los Angeles Lakers after winning 61 games. In 1992, Armstrong averaged double-digit scoring while coming off the bench behind longtime starter John Paxson to help the Bulls win 67 games and their second straight title. In 1993, he locked down the starting job, contributing to a 57–25 record and the Bulls' third straight title. He also claimed the NBA's three-point field goal percentage crown with a mark of .453 on 63-for-139 shooting.

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