Adelaide T. Lambert (October 27, 1907 – April 17, 1996), also known by her married name Adelaide Ballard, was an American competition swimmer for the Women's Swimming Association of New York, who earned a gold medal at the 1928 Amsterdam Olympics, setting a world record in the 4x100-meter freestyle relay.

Most American articles that detail her swimming achievements note that by the age of 14 that Cristobal, on Panama's West Coast, not Ancon where she was born, was her home.

One of her primary coaches at the Women's Swimming Association of New York, Louis Handley, advocated as many as a 10-beat kick for each full two strokes of his swimmer's arms.

[2][5] At the age of only 14, while still living in Panama, she swam 100 yards in a time of 1:09.4, approaching the American record.

[5] Around the age of 15, in a 220-yard handicap swum on August 8, 1923, representing the Women's Swimming Association of New York, Lambert finished first with a time of 2:51.2, in a meet sponsored by the International Printers' Tournament at Manhattan Beach.

[8] Lambert was the Amateur Athletic Union (AAU) champion in freestyle, backstroke, and the individual medley events.

[1] At the 1924 Olympic trials, at Briarcliff Lodge in Scarsdale, New York, Lambert qualified, but was not able to travel with the U.S. team after she became ill just before the scheduled steamship departed for Paris.

[1] At the age of 20, Lambert competed as a member of the winning U.S. team in the women's 4×100-meter freestyle relay at the August, 1928 Summer Olympics in Amsterdam, setting a new world record in both the semi-finals and the finals.

Her relay team included Albina Osipowich, Eleanor Garatti and Martha Norelius.