Hadi or Hady (Arabic: هادي) is an Arabic masculine given name and surname. Al-Hadi is one of the 99 names of God in Islam meaning guide (from the Arabic triconsonantal root ه د ي‎; also present in hidayah).

• Hadi Saei (born 1976), Iranian taekwondo athlete
• Hadi Elazzi (born 1973), Turkish music producer and manager
• Hadi Aghily (born 1980), Iranian footballer
• Hadi Kazemi (born 1976), Iranian actor, narrator, sculptor, painter and photographer
• Hadi Khorsandi (born 1943), Iranian poet, satirist and editor
• Hadi Norouzi (1985–2015), Iranian footballer
• Hadi Shakouri (born 1982), Iranian footballer
• Hadi Teherani (born 1954), Iranian-German architect and designer living in Germany
• Hadi al-Mahdi (c. 1967 – 2011), Iraqi journalist, radio talk show host, and assassination victim
• Hadi Thayeb (1922–2014), Indonesian diplomat and politician
• Hadi Ghaffari (born 1950), Iranian Hujjat al-Islam
• Hadi Khamenei (born 1947), Iranian reformist politician, mojtahed and linguist
• Hadi al-Modarresi (born 1957), Iranian Ayatollah
• Mohammad Hadi Ghazanfari Khansari (born 1957), Iraqi-born Iranian Ayatollah
• Mohammad Hadi Milani (1892-1975), Iranian Ayatollah
• Hadi Al-Amiri (born 1954), Iraqi general and politician
• Hadi al-Bahra (born 1959), Syrian politician
• Hadi Al Masri (born 1986), Syrian footballer
• Hadi Tiranvalipour (born 1998), Iranian taekwondo practitioner

• Hady Amr (born 1964), U.S. political advisor and Special Envoy
• Hady Habib (born 1998), Lebanese tennis player
• Hady Khashaba (born 1972), Egyptian footballer
• Hady Mirza (born 1980), Singaporean singer
• Hady Shahin (born 1986), Egyptian handball player

• Abd Rabbuh Mansur Hadi (born 1945), Yemeni President
• Noor Hadi (born 1986), Indonesian footballer
• Saiyid Muhammad Hadi (1863-1939), Indian agricultural technologist
• Seftia Hadi (born 1991), Indonesian footballer

• Abdul Hadi, Arabic theophoric name
• Mahdi, Arabic theophoric name
• Huda (given name), Arabic gender-neutral theophoric name

• Arabic name