Opus card

Opus card
Location	Quebec, Canada
Launched	2008–2009
Currency	CAD
Credit expiry	None
Validity	Exo; Réseau express métropolitain; Société de transport de Montréal; Société de transport de Laval; Réseau de transport de Longueuil; Reseau de transport de la Capitale; Société de transport de Lévis; All suburban transit authorities (see article);
Website	carteopus.info

Opus (stylized as OPUS) is a rechargeable, dual interface (contact/contactless) stored-value smart card using the Calypso Standard and is used by major public transit operators in Greater Montreal and Quebec City, Quebec, Canada. It complies with the ISO/IEC 14443 standard for smartcards and can be read by smartphones with an NFC antenna.

The name of the card in French, Carte Opus, is a pun on the word in French for smart cards with embedded chips, carte à puce.

Since the reorganization of public transport governance in metropolitan Montreal came into effect on June 1, 2017, the Opus ticketing system has been the property of the Autorité régionale de transport métropolitain (ARTM), which has entrusted its management to the Société de transport de Montréal (STM).