RTM may refer to:
- Radio Televisyen Malaysia, a Malaysian state-owned public broadcaster
- Radio Thamesmead, defunct South-East London radio station renamed to Time 106.8
- Radiodiffusion-Télévision du Mali, the primary radio and television network of the Malian state broadcaster
- Read the manual
- Reading Terminal Market, a farmer's market in Philadelphia
- Régie des Transports de Marseille, public transport authority and operator of the Marseille Metro
- Registered trademark
- Release to manufacturing - the stage the software release cycle when the software is sold as part of a bundle with related hardware. This precedes the final general availability stage.
- Remember the Milk, calendar and reminder software
- Remote temperature module, used in HVAC systems to measure temperature of an interior space or of the outside air
- Representational Theory of Mind, a philosophical theory of the mind considering representations as the main access way to reality
- Representative town meeting, a form of municipal legislature used in Massachusetts, New Hampshire, Connecticut and Vermont
- Requirements traceability matrix, a table that correlates any two baselined documents that require a many-to-many relationship to determine the completeness of the relationship
- Resin transfer molding
- Return to manufacturer, a manufacturer-approved return of faulty goods by a customer for refund, repair, or replacement
- Right to Manage, a leaseholders right under United Kingdom law
- Robert Tappan Morris, Jr., creator of the Morris worm
- Rotterdam The Hague Airport (IATA code)
- RTM Restaurant Group, an Arby's franchise