Fire, police and ambulance crews have rushed to Risdon Prison on Hobart's eastern shore after fires were lit in two cells.
Tasmania Police said in a statement on Wednesday night that the prison was contained during an "unfolding incident" and police remained on the scene patrolling the perimeter as a precaution.
Emergency crews were sent to the prison around 7.30pm.
Acting Director of Prisons David Jackson said in a statement that fires had been lit in two cells but were quickly put out by prison staff.
"There was no risk to the community. No one was injured as a result of the incident," he said.
A number of prisoners were relocated within the jail following the incident.
"An internal investigation has begun and the perpetrators will face disciplinary action," Mr Jackson said.