The 2018–19 Regional Four Day Competition was the 53rd edition of the Regional Four Day Competition, the domestic first-class cricket competition for the countries of the Cricket West Indies (CWI). The competition started on 6 December 2018 and concluded on 17 March 2019. Six teams contested the tournament – Barbados, Guyana, Jamaica, the Leeward Islands, Trinidad and Tobago, and the Windward Islands. Guyana were the defending champions. The players' draft for the tournament took place in May 2018.