A payphone (alternative spelling: pay phone or pay telephone or public phone) is typically a coin-operated public telephone, often located in a telephone booth or in high-traffic public areas. Prepayment is required by inserting coins or telephone tokens, swiping a credit or debit card, or using a telephone card.

The company that operates the payphone generally pays either rent or a revenue share to the owner of the property where the phone is installed.

Invented in the late 19th century, payphones became ubiquitous worldwide in the 20th, enough to contribute to the notion of universal access to basic communication services. The charge for a call may be a flat rate, or dependent on call duration. Following the explosive growth of mobile telephony, the use of payphones, and the number installed, has decreased greatly; several countries and areas have now abolished their payphone services altogether.

Most payphones in Canada are owned and operated by large telecom providers such as Bell, Telus Communications, and SaskTel. In the last 20 years, customer-owned coin-operated telephones (COCOT) have also appeared in the market, but their numbers are smaller due to the emergence of mobile phones.

The cost of most local payphone calls is 50 cents CAD, having increased from 25 cents since 2007. Payphones in Alberta were 35 cents for a time, but in most jurisdictions the price simply doubled. Newer phones allow users to use calling cards and credit cards. For coin-paid long distance, COCOTs are less expensive for short calls (typically $1 for three minutes) than incumbent providers (whose rates start near $5 for the first minute).

Dialing 0 for the operator and 911 calls are still free.

The Toronto Transit Commission deploys payphones on all subway platforms as a safety precaution; a blue "Crisis Link" button on 141 payphones connects directly with Distress Centres of Canada as a free suicide prevention measure.

As of 2013, there were about 70,000 payphones across the country.