The Santer-Poos I Ministry was the government of Luxembourg between 20 July 1984 and 14 July 1989. It was the first of three led by Prime Minister Jacques Santer. Throughout the ministry, the Deputy Prime Minister was Jacques Poos. It was formed following the general election of 1984. It represented a coalition between Santer's Christian Social People's Party (CSV) and Poos' Luxembourg Socialist Workers' Party (LSAP), which had been elected the largest and second-largest parties in the legislature.