Dreyer is a common German surname originating from Grübe in Holstein Germany. Notable people with the surname include:

• Benjamin Dreyer (b. 1958), American writer and copy editor
• Benedikt Dreyer (1495–1555), German sculptor, carver and painter
• Carl Theodor Dreyer (1889–1968), Danish director
• Dave Dreyer (1894–1967, US composer & pianist
• Dekker Dreyer (b. 1980), American director and producer
• Edward L. Dreyer (1940–2007), American historian of Ming China
• Frederic Charles Dreyer (1878–1956), officer of the Royal Navy
• Gordon Dreyer (1914–2003), English footballer
• Harry Dreyer (1892–1953), English footballer
• Henry Dreyer (1911–1986), American athlete
• Jake Dreyer (b. 1992), American guitarist for the band Witherfall and Iced Earth
• Jim Dreyer (b. 1963), marathon swimmer
• John Louis Emil Dreyer (1852–1926), Danish-British astronomer
• Malu Dreyer (b. 1961), German politician (SPD)
• Olaf Dreyer, German theoretical physicist
• Pam Dreyer (b. 1981), American ice hockey player
• Peter Dreyer (b. 1939), South African writer and politician
• Rosalie Dreyer (1895–1987), Swiss-born naturalized British nurse and administrator

• Dreyer's, an ice cream brand
• Dreyer objects, a former way of referring to NGC objects
• Dreier (disambiguation)