The 2018–19 South West Peninsula League season was the twelfth in the history of the South West Peninsula League, a football competition in England, that feeds the Premier Division of the Western Football League.
[1] At the end of this season, significant restructuring of the league was to take place.
For 2019–20, the league will consist of two Step 6 divisions of twenty clubs each.
Two new clubs joined the league: Reserve sides are not eligible for promotion to Step 5.
Division One East featured 19 clubs, increased from 18 the previous season, after Totnes & Dartington and Galmpton & Roselands resigned from the league, and three new clubs joined: Division One West featured 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.