2018–19 South West Peninsula League Division One West

Division One West will feature 15 clubs, reduced from 18 the previous season, after Millbrook and Elburton Villa were promoted to the Premier Division, Illogan RBL were relegated, and Penryn Athletic left the league. One new club joined:


 * Bere Alston United, promoted from the East Cornwall League.


 * Updated to 23:44, 4 June 2018 (UTC)