Abstract: The track lock for snowmobiles is a portable anti-theft device secured to the track of a snowmobile. The device is in the form of a main arm which is longer than a standard snowmobile track. Clamps are included for securing the main bar to the track in the form of one fixed clamp and one movable clamp. A lock is provided for fixing the movable clamp in place while the device is in use. Wings extend outward from the device across outer edge sections of the track to prevent the device from being removed by cutting the track. Guards in the form of flanges are also included on the device to surround and protect the locking mechanism. A flexible member extends through the main arm and connects between the first and second clamps. The flexible member is made of a suitable high tensile strength material to resist being cut therethrough.