The Rio Jaguari is a river in São Paulo state in southeastern Brazil, flowing as a tributary of the Paraíba do Sul. The river is approximately 53.2 miles in length and is impounded along its course by the Represa de Jaguari, a reservoir located near São José dos Campos.

The Represa de Jaguari is accessible from São José dos Campos via a dirt road, or by taking the exit at kilometer 162 of the Dutra highway. A boat launch area exists at the reservoir, making it a practical put-in point for small craft. The water at the reservoir is clean. A small bar and restaurant operates near the boat launch area, though with variable hours, and on weekends temporary kiosks selling food and drinks are typically present in the nearby parking area overlooking the water. The reservoir also sees use by jet skis and fishing boats, particularly on weekends when it can become busy.

Brazilian regulations require recreational vessels to be registered with the Navy (DPC) and operators to obtain a Vessel Inscription Title (TIE/TIEM) before operating on Brazilian waters; this document is valid for five years. Paddlers planning a trip on the Rio Jaguari should confirm current access permissions and property boundaries, as some access points may border private land.