RID
RID may refer to:

Isaiah ben Mali di Trani (the Elder), an Italian Talmudist
Radial immunodiffusion, a scientific technique for measuring the quantity of an antigen
Radionuclide identification device, a hand-held instrument for the detection and identification of radioactive sources
Refractive index detector, a type of chromatography detector
Registry of Interpreters for the Deaf, an American Sign Language interpreters organization
Relative identifier, a component of Microsoft Windows NT security
RID (insect repellent), an Australian brand
Rivista Italiana Difesa, an Italian magazine related to military and geo-strategic issues
Robots in Disguise, an English electro band
Royal Institute Dictionary, a prescriptive dictionary of Thailand
Real-time Inter-network Defense, a reporting method for sharing incident-handling data between networks