RL, Rl or rl may refer to:
- Rl (digraph), a digraph in Australian Aboriginal languages representing a retroflex lateral
- RL (complexity), the complexity class of problems
- NL (complexity) or RL, another complexity class
- Radio Liberty, American political broadcasting station merged with Radio Free Europe
- Republic of Lebanon, a country
- RL circuit, a circuit with a resistor and an inductor
- Acura RL, an automobile
- ReLoad, 1997 album by Metallica
- Real life, a term for the life in the real world
- Registered Locksmith, a trade qualification awarded to members of the Associated Locksmiths of America
- Reinforcement learning, a sub-area of machine learning
- Réseau Luxembourgeois des Amateurs d'Ondes Courtes, an amateur radio organization in Luxembourg
- Polo Ralph Lauren's NYSE ticker symbol
- Royal Phnom Penh Airways IATA code
- Reconstituted leaf, a type of tobacco processing used in some cigarettes
- Rugby league, a sport
- Residual Latex, excessive latex buildup.
- Roxbury Latin, a boys' preparatory school in Roxbury, MA
Read more about RL: People Known By The Given Initials