Ulf Hjalmar Kristersson (born 29 December 1963) is a Swedish politician who has served as the prime minister of Sweden since 2022. He has been the leader of the Moderate Party (M) since 2017 and a member of parliament (MP) for Södermanland County since 2014, previously holding a seat for Stockholm County from 1991 to 2000. Kristersson also served as minister for social security under Prime Minister Fredrik Reinfeldt from 2010 to 2014 and as chairman of the Moderate Youth League from 1988 to 1992.