The 2019 Castrol Toyota Racing Series was the fifteenth running of the Toyota Racing Series, the premier open-wheel motorsport category held in New Zealand. The series consisted of fifteen races at five meetings. It began on 10 January at Highlands Motorsport Park, in Cromwell, and concluded on 10 February with the 64th running of the New Zealand Grand Prix, at Circuit Chris Amon in Feilding.
The championship, as well as the 2019 New Zealand Grand Prix was won by rookie Liam Lawson; who became the first New Zealander to win the championship since Nick Cassidy in 2013.
Champion Liam Lawson and runner-up Marcus Armstrong both took five wins apiece, whilst Cameron Das, FIA Formula 3 European Championship driver Lucas Auer, Esteban Muth, Brendon Leitch and Artem Petrov all had one race win each.