Frederick of Hesse may refer to: Frederick, Landgrave of Hesse-Eschwege (1617–1655) King Frederick I of Sweden (1676–1751), Landgrave of Hesse Frederick II, Landgrave of Hesse (1720–1785) Prince Frederick of Hesse (1747–1837), Danish general, third son of Frederick II, Landgrave of Hesse Prince Frederik of Hesse (1771–1845), Danish general, son of Prince Charles of Hesse and nephew of previous Frederick William of Hesse (1820–1884), second cousin of previous, and his titular successor since 1875 Frederick William II of Hesse (1854–1888), eldest son of the previous Alexander Frederick of Hesse (1863–1945), brother of the previous Prince Frederick Charles of Hesse (1868–1940), Landgrave of Hesse and elected King of Finland