3R

3R or three Rs 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, a widely used abbreviation for the waste management hierarchy: reduce, reuse, and recycle
 * The three Rs, an abbreviation for consumer remedies under Australian Consumer Law when consumer guarantees of goods are not satisfied: refund, replace, and repair
 * The three Rs (animal research), principles for ethical use of animals in testing: replacement, reduction, refinement
 * Ronaldo, Rivaldo, and Ronaldinho, dubbed "The three Rs", the main attacking trio of Brazil at the 2002 FIFA World Cup
 * The 3Rs, an experimental short film by David Lynch
 * 3R Computers, Inc., a defunct American computer company based in Massachusetts
 * 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


 * The 3Rs of Junior Forest Wardens (a Canadian outdoor-education program for families): Responsibility to yourself, Responsibility to others, Responsibility to your community and the planet
 * Return, Reclamation, Rehabilitation, rebel group in Central African Republic
 * Relief, recovery, and reform, programs that were designed under these three categories during the New Deal