Fire crews are dealing with a "well-developed" blaze at Airth Castle.
The incident was reported just after 1am this morning.
Six crews are at the derelict hotel.
The Scottish Fire and Rescue Service say no casualties have been reported.
There is no wider threat to the general public.
They're also warning residents that water supplies may be reduced in the area.
Pedestrian seriously injured after Alloa incident
Council tax rise planned for Stirling
Clacks Council facing "challenging" pressures
Council tax to rise in Falkirk
Call for action for Tillicoultry RAAC residents