In case of any competition changes please keep checking back and the links to organisers websites. Only UK Athletics / Welsh Athletics licenced events are listed.
- 26/06/2021 Afan Forest 10km Half Marathon & Marathon Trail Races @ Port Talbot
- 04/07/2021 Porthcawl 10km
- 08/07/2021 European Athletics U23 Championships @ Bergen, Norway Until 11th July
- 11/07/2021 Ammanford 10km Incorporating the West Wales Championships
- 11/07/2021 Snowdonia 10km, Half, Full & Ultra Trail Marathons @ Llanberis
- 13/07/2021 Diamond League @ London
- 15/07/2021 European Athletics U20 Championships @ Tallinn, Estonia Until 18th July
- 23/07/2021 Olympic Games @ Tokyo, Japan Until 8th August
- 25/07/2021 Tenby 10km
- 25/07/2021 Fforest Fawr 10km Trail Race @ Caerphilly
- 01/08/2021 Barry Island 10km
- 26/08/2021 European Athletics U18 Championships @ Rieti, Italy Until 29th August
- 05/09/2021 Cardiff 10km
- 12/09/2021 Great North Run Half Marathon @ Newcastle
- 19/09/2021 Swansea Bay 10km
- 26/09/2021 Pembrokeshire Half Marathon & 10km
- 03/10/2021 London Marathon
- 03/10/2021 Cardiff Half Marathon
- 24/10/2021 Newport Marathon & 10km
- 30/10/2021 Snowdonia Marathon Eryri 2021 incorporating Welsh Masters Championships