Mariager is a town in Denmark with a population of 2,682 (1 January 2024). It is situated on the southern shores of the inlet of Mariager Fjord in Mariagerfjord municipality, North Denmark Region in Jutland. This part of Jutland is also known as Kronjylland (Crown Jutland).

• Mariane Bournonville (1768 in Mariager – 1797) a ballerina, active at the Royal Danish Ballet in 1784-1796
• Vilhelm Dahlerup (1836 in Mariager – 1907) architect who specialized in the Historicist style
• Budtz Müller (1837 in Mariager – 1884) a pioneering Danish photographer
• Philip Smidth (1855 in Mariager – 1938) a prolific architect in the Historicist style
• Peter Nansen (1861–1918 in Mariager) novelist, journalist, and publisher
• Aksel Nielsen (1901 in Mariager – 1984) a Danish-American philanthropist, emigrated 1910
• Erik Bach (born 1946 in Mariager), classical composer and former principal of Royal Academy of Music in Aarhus
• Emmelie de Forest (born 1993), singer and songwriter, brought up in Mariager

• Thomas Andie (born 1972 in Mariager), former professional footballer, over 200 club caps
• Kim Christensen (born 1984 in Mariager) athlete, competed in the shot put at the 2012 Summer Olympics

• Mariager Trade Association
• Mariagerfjord municipality