Abstract: A bar clamp configured for engagement with a workpiece is provided. The bar clamp includes a pair of parallel elongated bars, each extending along a longitudinal axis. The bar clamp also includes a fixed connector and a movable connector extending along a transverse axis perpendicular to the longitudinal axis for connecting the elongated bars together and maintaining a transverse separation therebetween. The bar clamp further includes an adjustment mechanism for adjusting a transverse separation between the elongated bars and for compressing the workpiece along the transverse axis, a positioning mechanism for adjusting a position of the movable connector along the longitudinal axes of the elongated bars, and a longitudinal compression mechanism connected to the fixed connector for compressing the workpiece along the longitudinal axis. A bar clamp assembly for engagement with a workpiece and including a plurality of spaced-apart bar clamps configured for receiving therebetween the workpiece is also provided.