Golden Globes
Mar 10 5th Golden Globes: "Gentleman's Agreement", Ronald Colman, & Rosalind Russell win

Ronald Colman
- Mar 11 Jewish Agency of Jerusalem bombed
- Mar 11 WBAL TV channel 11 in Baltimore, MD (CBS) begins broadcasting
- Mar 12 -5°F lowest temperature ever recorded in Cleveland in March
- Mar 13 Ireland beats Wales, 6-3 at Ravenhill Stadium, Belfast to clinch the Five Nations Rugby Championship and first Grand Slam
- Mar 14 Freedom Train arrives in San Francisco
Event of Interest
Mar 15 Sir Laurence Olivier on the cover of LIFE magazine

Laurence Olivier
- Mar 15 WCAU TV channel 10 in Philadelphia, PA (CBS) begins broadcasting
Event of Interest
Mar 16 Billie Holiday is released from prison early because of good behaviour

Billie Holiday

Josip Broz Tito

Joseph Stalin
Academy Awards
Mar 20 20th Academy Awards: "Gentleman's Agreement", Loretta Young, Ronald Colman win

Loretta Young

Ronald Colman
- Mar 20 102nd Grand National: 50/1 chance Sheila's Cottage first mare to win the GN for 46 years; ridden by Irish jockey Arthur Thompson
- Mar 21 "Stop the Music" with Bert Parks premieres on ABC radio
- Mar 21 LPGA Titleholders Championship Women's Golf, Augusta CC: Patty Berg wins her 4th Titleholders title by 1 stroke ahead of Babe Zaharias and Peggy Kirk
- Mar 23 10th NCAA Men's Basketball Championship: Kentucky beats Baylor, 58-42; Wildcats' first victory in first title game
- Mar 23 John Cunningham sets world altitude record (54,492' (18,133 m))
- Mar 27 The Second Congress of the Workers' Party of North Korea is convened
- Mar 27 Just 11 days after being released from prison, Billie Holiday plays in front of a sold-out crowd at Carnegie Hall
- Mar 28 2nd Tony Awards: Mister Roberts win
- Mar 29 Drachtster Boys soccer team forms in Drachten
- Mar 29 Yanks & Red Sox tie at 2-2 in 17, spring training game
- Mar 31 US Congress passes Marshall Aid Act to rehabilitate war-torn Europe