Hammer or The Hammer is a nickname for a number of people:

• Hank Aaron, baseball player
• Jorg Albertz, football player
• Glen Allen, Fast-pitch softball player
• Mark Coleman, mixed-martial artist
• Tom DeLay, a U.S. Congress Representative from Texas
• Edward I, King of England, "Hammer of the Scots"
• MC Hammer, American MC
• Paul Hammersley, SCALA Build Manager
• Mark Hildreth, pro wrestler
• William Hinds, co-founder of Hammer Films
• Thomas Hitzlsperger, a German footballer, "Der Hammer"
• Charles Martel, a Frankish king in the Eighth Century
• Jim Shapiro, personal injury lawyer
• Greg Valentine, professional wrestler
• Adam Wainwright, baseball player
• Fred Williamson, football player and actor
• Josh Willingham, baseball player