Patrol Boat, River or PBR, is the United States Navy designation for a small rigid-hulled patrol boat used in the Vietnam War from March 1966 until the end of 1971.

They were deployed in a force that grew to 250 boats, the most common craft in the River Patrol Force, Task Force 116 and were used to stop and search river traffic in areas such as the Mekong Delta, the Rung Sat Special Zone, the Saigon River and in I Corps.

The PBR was a versatile boat with a fiberglass hull and water jet drive which enabled it to operate in shallow, weed-choked rivers. It drew only two feet of water fully loaded. The drives could be pivoted to reverse direction, turn the boat in its own length, or come to a stop from full speed in a few boat lengths.

PBRs were operating with the U.S. Naval Reserve up until 1995 at Mare Island, California prior to the base's closure due to BRAC action that year. A few are in museums and others are in private hands.