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3R may refer to:

  • The three Rs, a widely used abbreviation for the basic elements of a primary school curriculum: reading, 'riting (writing), and 'rithmetic (arithmetic)
  • The Three Rs (animals), principles for ethical use of animals in testing: replacement, reduction, refinement
  • 3R (optical regenerator), an optical communications repeater that performs reamplification, reshaping, and retiming
  • Intelsat 3R, a former communications satellite
  • Yaesu VX-3R, an ultra-compact dual band amateur radio transceiver
  • British Rail Class 206, Southern Region designation 3R from 3-car Reading Line stock
  • 3R (print size), a standard consumer print size for photographs

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