The Montgomery Bus Boycott was from December 5th, 1955 to December 20th, 1956. This was directed at Montogmery City Buses to protest against segregated seating. The call to action for this movement was Rosa Parks arrest that lead to discussion from African Leaders from organizations like th to NAACP to put this boycott in place.
Another example of a bus boycott from the civil rights time was the Baton Rouge Bus Boycott of 1953. Some of the issues were the same like segregated seating, and having to walk to work. But what was different about this boycott was that the white bus drivers went on strike for not agreeing with the rule changes about blacks being able to sit in the front seats when white people weren't on the bus.
The bus drivers declared victory, so blacks across Baton Rouge teamed up with the UDL, and stopped riding the buses for a week. They gained victory on June 24, but had to compromise with the whites, since they could have the first two rows.
A more modern boycott that has been going on for years is the SeaWorld Orca boycott. SeaWorld breeds and has Orca shows, but they've violated several animal welfare rights. Animal welfare activists have been fighting against SeaWorld, and attendance to these shows have dropped significantly. By 2019, all of the Orca whales from every SeaWorld will be placed in a natural habitat.