Rd is an abbreviation for road. It may also refer to:
RDX is an organic compound with the formula (O2NNCH2)3. It is a white solid without smell or taste, 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.
The RD-170 (РД-170, Ракетный Двигатель-170, Rocket Engine-170) is the world's most powerful multi-combustion chambered liquid-fuel rocket engine, designed and produced in the Soviet Union by NPO Energomash for use with the Energia launch vehicle.
RDS-37 was the Soviet Union's first two-stage hydrogen bomb, first tested on 22 November 1955. The weapon had a nominal yield of approximately 3 megatons.
RDS Arena is a multi-purpose sports stadium, owned by the Royal Dublin Society (RDS) and located in the Dublin suburb of Ballsbridge, Ireland.
The RD-191 is a high performance single-combustion chamber rocket engine, developed in Russia. It is derived from the RD-170 originally used in the Energia launcher.