William Reais

William Reais (born 4 May 1999) is a Swiss sprinter competing primarily in the 200 metres. He competed in the 200 metres at the 2020 Summer Olympics. He also holds the Swiss national indoor record for the same event.

Achievements
Information from his World Athletics profile unless otherwise noted.

Personal bests
Outdoor Indoor
 * 100 metres – 10.35 (La Chaux-de-Fonds 2020)
 * 200 metres – 20.24 (Basel 2020)
 * 400 metres – 46.39 (Bellinzona 2020)
 * 60 metres – 6.66 (Magglingen 2021)
 * 200 metres – 20.97 (Magglingen 2021) NR

Circuit wins and titles

 * IAAF World Challenge Meeting
 * 2023: Ostrava Golden Spike (4 x 100 m relay)

National titles

 * Swiss Athletics Championships
 * 100 metres: 2023
 * 200 metres: 2020, 2022, 2023


 * Swiss Indoor Athletics Championships
 * 200 metres: 2018, 2019, 2020, 2021
 * Swiss U23 Championships
 * 100 metres: 2021
 * 400 metres: 2020
 * Swiss U20 Championships
 * 200 metres: 2017, 2018
 * Swiss U20 Indoor Championships
 * 60 metres: 2018
 * 200 metres: 2018
 * Swiss U18 Championships
 * 100 metres: 2016