A fare strike is a direct action in which people in a city with a public transit system carry out mass fare evasion as a method of protest. Jumping turnstiles, boarding buses through the back or very quickly through the front, and leaving doors open in subway stations are some tactics used. In some cases, transit operators obstruct the fare box to prevent anyone from paying. Often, fare strikes are used to protest against fare hikes and service cuts, but they can also organize solidarity between riders and drivers.

Fare evasion or fare dodging is the act of travel without payment on public transit. When considered problematic, it is mitigated by revenue protection officers and ticket barriers, staffed or automatic, are in place to ensure only those with valid tickets may access the transport. The term fare avoidance is sometimes used as a euphemistic synonym and sometimes used to refer to the lawful use of much cheaper tickets.