The San Juan River is one of the main river system in Metro Manila, Philippines, and is a major tributary of the Pasig River. It begins near La Mesa Dam as the San Francisco del Monte River, which officially takes on the name San Juan River when it meets with Mariblo Creek in Quezon City. As the San Juan River, it passes through Quezon City, San Juan City, the District of Sta Mesa, Manila, and Mandaluyong City.
Aside from the San Francisco del Monte River, the San Juan River has five creeks as its main tributaries (starting from its mouth going upstream):
- Buhangin Creek in Mandaluyong is the tributary nearest to the river's confluence with the Pasig. Its mouth is in Barangay Población, Mandaluyong, near the end of Boni Avenue where it meets New Panaderos Street. Its traceable headwaters are somewhere in Barangay Zuñiga.
- Maytunas Creek in San Juan has its mouth near Sevilla Bridge at the end of Shaw Boulevard, Barangay Daang Bakal. Its traceable headwaters are somewhere near the National Center for Mental Health in Mandaluyong.
- Dilimán Creek in Quezon City is the San Juan River's fourth main tributary. It joins the San Juan River in Barangay Kalusugan near E. Rodriguez Avenue behind St Luke's Medical Center. Its traceable headwaters are in Quezon City. The southernmost branch can be traced to Barangay Santolan near Blue Ridge, the northernmost in Brgy. Pansól near the UP Integrated School. Another branch in between can be traced to the campus ofAteneo de Manila University while a fourth branch, known as Victoria Creek, passes by the Anonas area and is notable for defining the boundary of Project 2 and 3 before finally ending in Project 3's Barangay Duyan Duyan.
- Mariblo Creek (sometimes referred to as Talayan Creek and Tanque Creek; also spelled Mariablo) in Quezon City is the fifth main tributary of the San Juan River. Mariablo Creek joins the San Francisco River to form the San Juan River in Barangay Mariblo, near Quezon Avenue. Its traceable headwaters are in Brgy Bungad near the corner of West Avenue and EDSA; at the opposite end of West Avenue, near the rotonda where West Avenue meets Quezon Avenue and Timog Avenue; and in the Ninoy Aquino Parks & Wildlife Center.
As the San Francisco del Monte River 
Upstream from the confluence with the Mariblo, the river is known as the San Francisco del Monte River. This river in turn divides upstream into the Dario Creek and the Pasong Tamo River.
Culiat Creek, whose headwaters are in the UP Diliman campus, empties into the Pasong Tamo River.
See also