Manuel "Mar" Araneta Roxas II (Tagalog: [ˈɾɔhas]; born May 13, 1957) is a Filipino former politician who served as a senator of the Philippines from 2004 to 2010. He is the grandson and namesake of former Philippine President Manuel Roxas. He served in the Cabinet of the Philippines as the 37th secretary of the interior and local government from 2012 to 2015 after serving as the 30th secretary of trade and industry from 2000 to 2003 and 38th secretary of transportation and communications from 2011 to 2012. He is the son of former senator Gerry Roxas.

After graduation from the University of Pennsylvania, Roxas worked as a banker in New York, mobilizing venture capital funds for small and medium enterprises. He served as the Representative of the Capiz's first district from 1993 to 2000. His stint as congressman was cut short after he was appointed by President Joseph Estrada as Secretary of Trade and Industry. He resigned from the position at the height of the Second EDSA Revolution and was later re-appointed by President Gloria Macapagal Arroyo in her new cabinet. He resigned again to run for a Senate seat in the 2004 election. Campaigning as Mr. Palengke, he was elected senator with 19 million votes, the highest ever garnered by a national candidate in any Philippine election at that time. Roxas co-authored the Expanded Value Added Tax Law (E-Vat).

Initially one of the leading candidates in the 2010 presidential election, he slid down to become a vice-presidential candidate in order to make way for fellow senator Benigno Aquino III, who won. Roxas was defeated by Makati mayor Jejomar Binay of PDP–Laban by a margin of 727,084 votes. He filed an electoral protest before the Supreme Court of the Philippines, with the Court sitting as the Presidential Electoral Tribunal. On June 7, 2011, President Aquino appointed Roxas as transportation and communications secretary to replace outgoing secretary Jose de Jesus, and he took office on July 4, 2011. Afterwards, on August 31, 2012, President Aquino nominated him as interior and local government secretary, replacing Jesse Robredo, who died in a plane crash.

Roxas was the standard-bearer of the Liberal Party for the 2016 presidential election. He was officially endorsed by President Aquino to continue the present administration's reforms, collectively dubbed Daang Matuwid ("straight path"), which he formally accepted on July 31, 2015. On August 3, 2015, Roxas officially tendered his resignation as interior and local government secretary to focus on his presidential campaign. After placing second in the election, Roxas conceded to Davao City mayor Rodrigo Duterte on May 10, 2016. He would later attempt a comeback to the Senate in 2019, but lost.

Manuel Araneta Roxas II was born on May 13, 1957, in Manila to Judy Araneta (1934–2025; of Bago, Negros Occidental) and Gerry Roxas (1923–1982; of Capiz), a Representative for Capiz (1957–1963) and a Senator (1963–1972).

Mar is one of the grandchildren of Manuel Roxas, the first President of the Third Philippine Republic (1946–48), and Trinidad de Leon. The couple married in 1955. He has two siblings: Maria Lourdes (married to Augusto Ojeda and mother of three) and Gerardo Jr. (1960–1993), a former congressman.

After grade school and high school at the Ateneo de Manila University, Roxas attended the Wharton School of the University of Pennsylvania in Philadelphia, majoring in Economics and earning a Bachelor of Science degree in 1979. After graduation, he worked for seven years as an investment banker in New York City, and became an assistant vice president of the New York-based Allen & Company.

Following the 1985 announcement by President Ferdinand Marcos of a snap election, Roxas took a leave of absence to join the presidential campaign of Corazon Aquino. In September 1986, President Corazon Aquino went to the United States. Roxas was one of those who organized a series of investment round-table discussions with the American business community.