• Registry of Interpreters for the Deaf
• Isaiah ben Maldi di Trani (the Elder)
• Retrieve Information for Display
• Relative ID
• The Royal Institute Dictionary of Thailand
• International Rule for Transport of Dangerous Substances by Railway
• Refractive-Index Detector

RiD may refer to:

• Transformers: Robots in Disguise, 2001 American Transformers line of toys and cartoon series
• Rivista Italiana Difesa, Italian magazine related to military and geo-strategic issues
• Robots in Disguise