They were attempting to get better seats at the Australia v Serbia men's basketball semi-final at the Rio Olympics without proper accreditation.
The athletes were questioned by police on Friday and released on Saturday.
Australia's chef de mission Kitty Chiller said her country's Olympians were "definitely not at fault".
Cyclists Ashlee Ankudinoff and Melissa Hoskins, rugby sevens player Ed Jenkins, archers Alec Potts and Ryan Tyack, rowers Olympia Aldersey, Fiona Albert and Lucy Stephan and hockey player Simon Orchard were the nine involved.
