| Event: | 0.5 to 1 Ton Sailing |
| Games: | 1900 Summer |
| Date: | First race: Second race: |
| Competitors: | 35 (documented) |
| Nations: | 3 |
| Teams: | 20 |
| Goldnoc: | GBR |
| Silvernoc: | FRA |
| Bronzenoc: | FRA |
| Goldnoc2: | FRA |
| Silvernoc2: | FRA |
| Bronzenoc2: | FRA |
The 0.5 to 1 ton was a sailing event on the Sailing at the 1900 Summer Olympics program in Meulan. Twenty boats started during the two races in the 0.5 to 1 ton. thirty–five competitors from three countries are documented. The races were held on 24 and 25 May 1900 on the river Seine.
| bgcolor=DodgerBlue align=center | ● | Meulan competition | bgcolor=Lime align=center | ● | Le Havre competition |
For the 0.5 to 1 ton the 15km (09miles) course in the Meulan course area was used.
The race was troublesome due to an almost complete absence of any wind and the existing wind was perpendicular to the course (river Seine) and blocked or diverted by trees and buildings.
Two separate races were sailed. No combined results were made.
Jean d'Estournelles de Constant one of the participants in this class was also the chef de bureau à la Direction des beaux-arts as well as secrétaire des courses du Cercle de la voile of the event. He also wrote the section on the Olympic sailing of 1900 in the official report.
Initially only the race on 24 May 1900 was part of the Olympic program. However the race on the 25 May 1900, initially part of the Exposition Universelle program, was afterwards awarded with an Olympic status.