Oatfield may refer to:

• Oatfield (confectioner), originating in Letterkenny, County Donegal
• Oatfield, Oregon, a census-designated place in the U.S. state of Oregon

• Composite honeycomb
• Composite Man
• Composite man
• Composite manufacturing
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• Composite (New York City Subway car)
• Composite Order
• Composite order
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• Composite plant
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• Composite resin
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• Composite Rules Shinty/Hurling
• Composite rules shinty–hurling
• Composite ship
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• Composite Simpson's method
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• Composite structure diagram
• Composite sync