Julian Castro, American lawyer and politician, 16th United States Secretary of Housing and Urban Development
Julián Castro ( HOO-lee-AHN, Spanish: [xuˈljan]; born September 16, 1974) is an American lawyer and politician from San Antonio. A member of the Democratic Party, he was the youngest member of President Obama's cabinet, serving as the 16th United States Secretary of Housing and Urban Development from 2014 to 2017. Castro served as the mayor of his native San Antonio, Texas from 2009 until he joined Barack Obama's cabinet in 2014.

Castro was mentioned as a possible running mate for Hillary Clinton during the 2016 presidential campaign. He is the twin brother of Congressman Joaquin Castro. On January 12, 2019, Castro launched his campaign for the Democratic nomination for President of the United States in 2020 in San Antonio. He dropped out of the presidential race on January 2, 2020, endorsing the candidacy of Elizabeth Warren soon after.