The leader of the Socialist Party is the most senior politician within the Socialist Party (, SP) in the Netherlands. The post is currently held by Jimmy Dijk, who succeeded Lilian Marijnissen on 13 December 2023.
The leaders outwardly act as the 'figurehead' and the main representative of the party. Within the party, they must ensure political consensus. Except during the tenure of Daan Monjé, the leader is always the lead candidate of the party list at election time. Outside election time the Leader can serve as the opposition leader. Since the tenure of Jan Marijnissen, the leader has always been the parliamentary leader of the Socialist Party in the House of Representatives.