Dier or DIER may refer to:

People

• Brett Dier (born 1990), Canadian actor
• Dirk Dier (born 1972), German tennis player
• Eric Dier (born 1994), English footballer
• Richard A. Dier (1914–1972), American judge
• Tobias Dier (born 1976), German golfer

Other

• Department of Infrastructure, Energy and Resources, a former department of the Tasmanian government
• Wakker Dier, Dutch animal welfare organisation
• Department for Industrial & Employment Relations of Malta

• Dyer (disambiguation)

This disambiguation page lists articles associated with the title Dier.
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