The 2023 Supersport World Championship was the twenty-seventh season of the Supersport World Championship, the twenty-fifth held under this name. The championship was won by Nicolò Bulega at the Portuguese round.

The Supersport World Championship, abbreviated to WorldSSP, is a motorcycle racing competition on hard-surfaced circuits, based on mid-sized sports motorcycles. Competition machines were originally based on production-based motorcycles with 600 cc to 955 cc engines, depending on the number of cylinders. After trials in UK national series British Supersport, from 2022 the regulations have changed to allow eligibility of larger-displacement engines, to reflect the engine sizes being produced and encourage different manufacturers.