Abstract: A security mounting device for a chain saw is disclosed which consists of a base plate carrying a downwardly directed channel spaced above and at one end of the base plate. The channel is adapted to receive and embrace the operator's handle of a chain saw. A pair of transversely spaced plates are carried at the other end of the base plate and project upwardly therefrom and are adapted to receive therebetween the chain bar of the saw. Holes are provided in the upper ends of the spaced plates which receive a demountable pin, said pin, when in place, being adapted to confine the chain bar within the transversely spaced plates. Resilient means such as rubber-like pads may be carried by the base plate and the channel to flexibly engage the saw motor housing and operator handle, respectively. The pin may be provided with a hole to receive a conventional pad lock to prevent removal of the saw from the device.