Ulf Hjalmar Kristersson (born 29 December 1963) is a Swedish Moderate Party politician. He is the Leader of the Opposition and Leader of the Moderate Party since October 2017. He has been a Member of the Riksdag (MP) for Södermanland County since 2014. He also was the country's Minister for Social Security from 2010 to 2014 and Chairman of the Moderate Youth League from 1988 to 1992.