ARQ or Arq may refer to:
- Automatic Repeat-reQuest, an error control mechanism for data transmission
- An admission request in H.323 Registration, Admission and Status (RAS) messages
- ARQ (journal), an architecture journal
- ISO 639-3 code for Algerian Arabic
ARQ is a scientific journal published by the School of Architecture of the Pontifical Catholic University of Chile. It publishes articles on a wide range of architecture-related topics, primarily on issues that are relevant to Chile and South America. Each issue is centered on one theme.