Ma'ruf Amin (born 11 March 1943) is an Indonesian politician, Islamic cleric, and lecturer who served as the 13th vice president of Indonesia from 2019 to 2024. Aged nearly 77 years old when inaugurated, he is the oldest Indonesian vice president to ever be sworn in.

He was the chairman of the Indonesian Ulama Council (Majelis Ulama Indonesia, or MUI) when he accepted the vice-presidential nomination. On 9 August 2018, President Joko Widodo announced that Ma'ruf would be his running mate in the 2019 Indonesian presidential election. Following his candidacy, he resigned as General Leader (rais 'aam syuriah) of Nahdlatul Ulama (NU), the world's largest Islamic organization.

Ma'ruf Amin was born during the Japanese occupation of the Dutch East Indies to Mohamad Amin and Maimunah. He first went to primary school in the kecamatan of Kresek. He continued his studies at Pesantren Tebuireng in Jombang, East Java, an influential Islamic boarding school established by NU founder Hasyim Asy'ari. Later, he received a bachelor's degree in Islamic philosophy from Ibnu Khaldun University in Bogor, West Java.

Shortly after graduating from college, Ma'ruf carried out dakwah missions in Jakarta. At that time, NU was still an active political party and Ma'ruf was elected to the Indonesian parliament, the People's Representative Council (or DPR, Dewan Perwakilan Rakyat) in the national election held in 1971. Six years later, in 1977, he was elected to the Jakarta City Council as a member of the United Development Party (Partai Persatuan Pembangunan or PPP) for one term (1977–1982) and served as leader of the PPP caucus. At the end of his term, Ma'ruf returned to academia and social activism. In 1989, he was appointed as a katib 'aam, a senior position within NU's syuriah, its supreme governing council. He then rose to be one of the rais, a leader, overseeing the executive leadership of Abdurrahman Wahid.

Following the fall of Suharto in 1998, Ma'ruf became an advisor to Wahid's National Awakening Party (Partai Kebangkitan Bangsa, or PKB) and advised Wahid throughout the period of his presidency of Indonesia from 1999 to 2001. Ma'ruf returned to active politics and represented the PKB in the national DPR from 1999 to 2004. During this second term in the DPR, Ma'ruf was chair of the Fourth Commission (agriculture, food, and maritime affairs) as well as member of the Second Commission (government affairs and regional autonomy) and Budgetary Board.

While a member of the DPR during 1999–2004, Ma'ruf chaired the Ulama Council's committee in charge of issuing legal opinions (fatwa). He did not seek re-election to the DPR in 2004 and returned to the Indonesian Ulama Council (MUI) to chair its National Sharia Committee (acting from 2004 to 2010). He also served as an advisor to President Susilo Bambang Yudhoyono in his Presidential Advisory Council from 2007 to 2014.

In 2015, Ma'ruf ran for the position of rais 'aam syuriah of the NU, equivalent to chair of the supreme governing council. He finished in second place after the incumbent Ahmad Mustofa Bisri from Rembang's Pesantren Raudlatuth Thalibin. In a significant development, Bisri withdrew his name from the race, and Ma'ruf was then elected to the position by NU's 33rd Congress.

Several weeks after his ascendancy to NU's highest post, Ma'ruf was elected to be the chair of MUI, succeeding Muhammadiyah's Din Syamsuddin on 27 August 2015.