The 2020 Cork Lower Intermediate Hurling Championship was the inaugural staging of the Cork Lower Intermediate Hurling Championship since its establishment by the Cork County Board. The draw for the group stage placings took place on 19 November 2019. The championship was scheduled to begin in April 2020, however, it was postponed indefinitely due to the coronavirus pandemic in Ireland. The championship eventually began on 1 August 2020 and, after being suspended once again on 5 October 2020, eventually ended on 21 August 2021.
The final was played on 21 August 2021 at Páirc UàRinn in Cork, between Castlemartry and Russell Rovers, in their first ever meeting in a county final in any grade. Castlemartyr won the match by 1-20 to 0-11 to claim the inaugural title.
Castlemartyr's Josh Beausang was the championship's top scorer with 3-50.
Regraded from the Cork Intermediate Hurling Championship
Promoted from the Cork Junior A Hurling Championship
The club rankings were based on a championship performance 'points' system over the previous four seasons.