Demir means iron in Turkish; it may refer to:

• Demir Demirkan, Turkish rock musician and songwriter
• Demir Demirev, Bulgarian weightlifter
• Demir Elmaağaçlı (born 1990), Turkish archer
• Demir Hotić, Bosnia and Herzegovina footballer
• Demir Ramović, Montenegrin footballer
• Demir Sabancı, Turkish businessman and entrepreneur

• Demir or D. Mir, pseudonyms of Romanian poet Mircea Demetriade
• Alihan Demir (born 1996), Turkish basketball player
• Aslı Demir (born 1999), Turkish female freestyle wrestler
• Aykut Demir, Turkish footballer
• Bahadır Demir (1942–1973), Turkish assassinated diplomat
• Cem Demir, Turkish footballer
• Ebru Demir (born 1976), Turkish social entrepreneur and chef
• Emine Demir (born 1993), Turkish footballer
• Erdin Demir, Swedish footballer of Turkish descent
• Evin Demir (born 2001), Turkish race walker
• Hamza Demir (born 1956), Swedish politician
• İlyas Demir, Turkish karateka
• Mahmut Demir, Turkish wrestler
• Mahmut Demir (futsal), Turkish futsal player
• Mazlum Demir (born 2003), Turkish racewalker
• Mustafa Demir, Turkish politician
• Neslihan Demir Darnel (born 1983), Turkish volleyballer
• Orhan Demir, Canadian jazz guitarist
• Şennur Demir (born 1982), Turkish female boxer and coach
• Yusuf Demir (born 2003), Austrian footballer
• Zeki Demir, Turkish karateka

• Demir Kapija, town in the Republic of Macedonia
• Demir Hisar (town), town in the Republic of Macedonia
• Demirović
• Temur (disambiguation)
• Timur
• Demir, Kemaliye