|Location||Santa Clara County, California|
|Primary inflows||Guadalupe Creek|
|Primary outflows||Guadalupe Creek|
|Basin countries||United States|
|Max. length||2,624 ft (800 m)|
|Max. width||492 ft (150 m)|
|Surface area||74 acres (300,000 m2)|
|Water volume||3,415 acre⋅ft (4,212,000 m3)|
|Surface elevation||618 ft (188 m)|
Guadalupe Reservoir is a reservoir in Santa Clara County, California, United States, about 5 miles (8 km) south of the city of San Jose, California. It is at an elevation of 614 feet (187 m). It has a surface area of 74 acres (300,000 m2) and a capacity of 3,415 acre feet (4,212,000 m3). The reservoir is located along Hicks Road on Guadalupe Creek, a tributary of the Guadalupe River. The Guadalupe River was named Rio de Nuestra Señora de Guadalupe on March 30, 1776 by the de Anza expedition, in honor of the Mexican saint who was the principal patron saint of the expedition. Guadalupe dam and reservoir, constructed in 1935, is one of the six original systems approved for construction by voters in 1934.
The California Office of Environmental Health Hazard Assessment (OEHHA) has developed a safe eating advisory for the reservoir, stating no one should eat any fish caught there.