Abstract: A bar clamp including a first bar member and a second bar member with the second bar member telescoping out from the first bar member. A securing mechanism, such as a pin in the first member, releasably secures the members together at a preferred telescoping position. The second bar member has a jaw member that can be advanced or retracted by means of a linear actuator and the first bar member has a jaw member that can be adjusted by positioning the cam-action locking mechanism in one of the notches disposed along the length of the first bar member. As a result of the telescoping relationship of the bar members, workpieces of varying sizes may be clamped between the jaw members without the need of multiple bar clamps of varying lengths.