Sadeq (in Arabic: صادق) is an Arab and Iranian given name and surname which is most common in Iran, Pakistan, and Arab countries. Sadegh is the Iranian variant. Other variants include Sadiq. It is the adjective form of the root word [صدق] which means truthfulness, so it means truthful.

Notable people with the name include:

Titular

• Sadeq Khan, a Faujdar of the Mughal Bengal's Sylhet Sarkar
• Sadeq Mohammad Khan IV (1861–1899), 10th Nawab of Bahawalpur who ruled the Bahawalpur State
• Sadeq Khan Zand (died 1781), also known as Mohammad Sadeq, the fifth Shah of the Zand dynasty from 1779 to 1781

Given name

• Sadeq Ali (died 1862), Bengali writer, poet and district judge from 19th century
• Sadeq Amin Abu Rass (born 1952), Yemeni politician, Chairperson of the Sana'a-based General People’s Congress
• Sadeq Chubak (1916–1998), sometimes Sādegh Choubak (1916–1998), Iranian author of short fiction, drama, and novels
• Sadeq Khalilian (born 1959), Iranian economist, academic, politician and government minister
• Sadeq Kia (1920–2002), Iranian man of letters, professor of Iranian languages
• Sadeq Larijani (born 1961), better known as Amoli Larijani, Iranian cleric, conservative politician
• Sadeq Naihoum (1937–1994), Libyan writer and journalist
• Sadeq Rohani (1926–2022), or Grand Ayatollah Sayyid Mohammad Sadeq Hussaini Rohani, Iranian Twelver Shia Marja
• Sadeq Sayeed (born 1953), Pakistani-born banker and businessman
• Sadeq Tabatabaei (1943–2015), Iranian writer, journalist, TV host, university professor

Middle name

• Ahmed Sadeq Al Khamri (born 1992), Yemeni footballer
• Ali Sadeq Benwan (born 1991), Iraqi footballer
• Mohammad Mohammad Sadeq al-Sadr (1943–1999), Iraqi Twelver Shi'a cleric of the rank of Grand Ayatollah

Surname

• Hamed Sadeq (born 1971), Kuwaiti sprinter

Village

• Sadeq, Iran, Sadeq (Persian: صادق, also Romanized as Şādeq) is a village in Ahudasht Rural District, Shavur District, Shush County, Khuzestan Province, Iran.