Ib is a Danish masculine given name which may refer to:

• Ib Andersen (born 1954), Danish ballet dancer and choreographer
• Ib Braase (1923–2009), Danish sculptor
• Ib Eisner (1925–2003), Danish artist
• Ib Frederiksen (fl. 1986–1990), Danish former badminton player
• Ib Friis (born 1945), Danish professor of botany
• Ib Geertsen (1919–2009), Danish painter and sculptor
• Ib Glindemann (1934–2019), Danish jazz musician and big band leader
• Ib Vagn Hansen (1926–2000), Danish cyclist
• Ib Jacquet (born 1956), Danish former footballer
• Ib Larsen (born 1945), Danish rower, 1968 Summer Olympics bronze medalist in the coxless pairs
• Ib Madsen (born 1942), Danish mathematician and professor
• Ib Melchior (1917–2015), Danish-American novelist, short story writer, film producer, director and screenwriter
• Ib Mossin (1933–2004), Danish actor, singer and director
• Ib Nielsen (1919–1994), Danish fencer
• Ib Nørholm (1931–2019), Danish composer and organist
• Ib Olsen (1929–2009), Danish rower, 1948 Summer Olympics bronze medalist in the coxed fours
• Ib Spang Olsen (1921–2012), Danish writer and illustrator
• Ib Schønberg (1902–1955), Danish film actor
• Ib Thomsen (born 1961), Norwegian politician