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 (film), a 2016 American film
- ARQ (journal), an architecture journal
- ISO 639-3 code for Algerian Arabic
- ARQ, a query engine for Jena