Rd or RD may refer to:
RDX is the organic compound with the formula (O2NNCH2)3. It is a white solid widely used as an explosive.
RDFLib is a Python library for working with RDF, a simple yet powerful language for representing information.
Rambus DRAM (RDRAM), and its successors Concurrent Rambus DRAM (CRDRAM) and Direct Rambus DRAM (DRDRAM), are types of synchronous dynamic RAM developed by Rambus from the late-1980s through to the early-2000s.
The RD-180 (РД-180, Ракетный Двигатель-180, Rocket Engine-180) is a rocket engine designed and built in Russia.
RDS-37 was the Soviet Union's first two-stage hydrogen bomb, first tested on November 22, 1955. The weapon had a nominal yield of approximately 3 megatons.
The RD-120 (GRAU Index 11D123) is a liquid upper stage rocket engine burning RG-1 (refined kerosene) and LOX in an oxidizer rich staged combustion cycle with an O/F ratio of 2.6. It is used in the second stage of the Zenit family of launch vehicles.
RDRAND (previously known as Bull Mountain) is an instruction for returning random numbers from an Intel on-chip hardware random number generator which has been seeded by an on-chip entropy source.
The RD-170 (РД-170, Ракетный Двигатель-170, Rocket Engine-170) is the world's most powerful liquid-fuel rocket engine, designed and produced in the Soviet Union by NPO Energomash for use with the Energia launch vehicle.