The group, called POWER, wants the transit agency to expand a pilot program that gave free Muni passes to 12,000 low-income students between April and June.
The group says the money to pay for the program's continuation is available.
"The Muni department pays the San Francisco Police Department $12 million each year to write tickets to young people," said Steve Williams with POWER. "We think it is a better service to provide $6 million to transport kids to and from school."
The cost of a Muni youth pass doubled last year from $10 to $20 per month.