- Mar 1 Boulder (Hoover) Dam fully completed
- Mar 1 A strike occurs aboard the S.S. California, leading to the demise of the International Seamen's Union and the creation of the National Maritime Union.
- Mar 3 Clarence Grimmett ends his Test career with 13 wkts in 5th Test v South Africa
Hindenburg Disaster
Mar 4 1st flight of the airship Hindenburg at Friedrichshafen, Germany
- Mar 5 Spitfire makes its 1st flight (Eastleigh Aerodrome in Southampton)
Academy Awards
Mar 5 8th Academy Awards: "Mutiny on the Bounty", Victor McLaglen & Bette Davis wins
- Mar 6 Belgium ends Locarno pact
Treaty of Interest
Mar 7 Adolf Hitler breaks the Treaty of Versailles by sending troops into the Rhineland
- Mar 8 The first stock car race is held in Daytona Beach, Florida.
- Mar 13 Irish-bred Golden Miller with Evan Williams aboard wins record 5th consecutive Cheltenham Gold Cup steeplechase at 21/20 favourite; only horse to complete Gold Cup-Grand National double
- Mar 14 Federal Register, 1st magazine of the US government, publishes 1st issue
- Mar 14 Wales beats Ireland, 3-0 in Cardiff to clinch the Home Nations Rugby Championship with a 2-1-0 record
Film Premiere
Mar 22 "The Great Ziegfeld" directed by Robert Z. Leonard and starring William Powell and Luise Rainer premieres in Los Angeles (Best Picture 1937
- Mar 23 Italy, Austria & Hungary sign Pact of Rome
Historic Event
Mar 23 Physician Joseph G. Hamilton injects a leukemia patient with a sodium radioisotope, first intravenous injection of a human with a radioisotope
- Mar 24 Detroit Red Wings beat Montreal Maroons, 1-0 in 16:30 of 6th period of OT; record Stanley Cup playoff game lasts 9 periods (176 minutes)
- Mar 25 200-inch mirror blank to build the Hale telescope leaves Corning New York for California (then largest telescopic mirror ever made)
- Mar 26 1st parliamentary debate on NZ radio
- Mar 26 200" telescope lens shipped, Corning Glass Works, NY-Cal Tech
- Mar 26 Mary Joyce ends a 1,000 mile trip by dog in Alaska
- Mar 27 WOS-AM in Jefferson City Missouri goes off the air
- Mar 27 95th Grand National: Fulke Walwyn scores back-to-back GN victories aboard Reynoldstown at 10/1
- Mar 29 10,000 watch the 200-inch mirror blank passing through Indianapolis
- Mar 29 Nazi propaganda claims 99% of Germans voted for Nazi candidates