| May 1, 1977 – Chantal Langlace wins marathon in Oiartzun, Spain in World Record 2:35:15 |
| May 1, 1977 – Chris Solinsky runs 26:59.60 for 10,000 meters and is 1st non-African to run sub-27 |
| May 3, 1975 – Christa Vahlensieck runs female World Record marathon 2:40:15.8 |
| May 5, 1956 – Jim Bailey runs first sub-4:00 mile in U.S. with 3:58.6 |
| May 6, 1954 – England’s Roger Bannister first to run sub-four minute mile (3:59.4) at Oxford |
| May 6, 1967 – Canada’s Maureen Wilton runs World Record marathon 3:15:23 in Toronto |
| May 6, 1979 – Renaldo Nehemiah runs World Record 110 meter hurdles in 13.00 seconds |
| May 6, 2018 – Galen Rupp Wins the Prague Marathon in 2:06:07 |
| May 7, 1967 – Tommie Smith runs World Record straightaway 220 yards in 19.5 seconds |
| May 8, 1909 – Frederick Barrett runs World Record marathon 2:42:31 |
| May 8, 1954 – Parry O’Brien breaks shot put ‘60-foot barrier’ with 60-5 ¼ at USC-UCLA dual meet |
| May 8, 1965 – Randy Matson breaks shot put ’70-foot barrier’ with 70-7 ¼ at SW Conf meet |
| May 9, 1971 – Elizabeth Bonner runs World Record marathon 3:01:42 in Philadelphia, PA |
| May 12, 1913 – Great Britain’s Harry Green runs World Record marathon 2:38:16.2 in London |
| May 12, 1928 – Emerson Spencer runs World Record 400 meters in 47.0 seconds |
| May 12, 1956 – Charlie Dumas and Bill Russell tie with 6-9 ¼ high jump at West Coast Relays |
| May 12, 1962 – Univ of Oregon breaks World Record 4-mile relay by 14 seconds in 16:09.0 |
| May 13, 1984 – Ingrid Kristiansen wins London Marathon in World Record 2:24:26 |
| May 15, 1948 – Mel Patton runs 9.3 to break 100 yard dash World Record at West Coast Relays |
| May 15, 1965 – Jim Ryun runs second prep sub-4:00 mile; this time against only preps |