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Class 3 may refer to:
- Classes of U.S. Senators
- NSB El 3, an electric locomotive of Norway
- NSB Di 3, a diesel locomotive of Norway
- Class 3, in the electrical Appliance classes
- Class III (U.S. Army), Petroleum Oils & Lubricants (POL), petroleum and solid fuels, including bulk and packaged fuels, lubricating oils and lubricants, petroleum specialty products; solid fuels, coal, and related products
- The third class in terms of hiking difficulty in the Yosemite Decimal System
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