Police are investigating a suspicious structure fire at Rossarden overnight.

Emergency services were called to the former Rossarden School House in Schell Street just before 1am after reports of a fire.

Tasmania Fire Service contained the fire before an investigation determined it was deliberately lit.

Nobody was inside the structure at the time and police are asking anyone with information to come forward.

Anyone with information is asked to contact police on 131 444 or Crime Stoppers on 1800 333 000 or at crimestopperstas.com.au. Information can be provided anonymously.  Please quote offence report number 778719.