Frederick of Denmark or Frederik of Denmark may refer to:
- Frederick I of Denmark (1471–1533), King of Denmark and Norway
- Frederick II of Denmark (1534–1588), King of Denmark and Norway
- Frederick III of Denmark (1609–1670), King of Denmark and Norway
- Frederick IV of Denmark (1671–1730), King of Denmark and Norway
- Frederick V of Denmark (1723–1766), King of Denmark and Norway
- Frederick VI of Denmark (1768–1839), King of Denmark and Norway
- Frederick VII of Denmark (1808–1863), King of Denmark
- Frederick VIII of Denmark (1843–1912), King of Denmark
- Frederik IX of Denmark (1899–1972), King of Denmark
- Frederik X of Denmark (born 1968), King of Denmark
- Frederick of Denmark (bishop) (1532–1556)
- Frederick, Hereditary Prince of Denmark (1753–1805)
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