Bluff can refer to various things.

• Bluff is a town in the South Island of New Zealand.
• Bluff is a town located in San Juan County, Utah in the United States.
• Bluff is a crater on Mars named after the New Zealand town.
• A bluff is also the name for a steep hill next to a river. They often primarily consist of limestone.
• In poker and other contexts, a Bluff is an attempt to deceive.
• Bluff is another name for liar's dice, a dice game.