Swimming at the 1984 Summer Olympics – Women's 100 metre breaststroke

The final of the women's 100 metre backstroke event at the 1984 Summer Olympics was held in the McDonald's Olympic Swim Stadium in Los Angeles, California, on August 2, 1984.

Records
Prior to this competition, the existing world and Olympic records were as follows.

The following records were established during the competition:

Heats
Rule: The eight fastest swimmers advance to final A (Q), while the next eight to final B (q).