Mount Tabor is an extinct volcanic vent with a city park on the volcano, located in Portland, Oregon's neighborhood of the same name. The name refers to Mount Tabor, Israel. It was named by Plympton Kelly, son of Oregon City pioneer resident Clinton Kelly.

The peak of Mount Tabor is at 636 feet (194 m) in elevation; about two-thirds of this is prominence since the surrounding land is at about 200 feet (61 m) in elevation.

Near the peak, where a basketball court and outdoor amphitheater are now situated, part of the cinder cone has been cut away, and the rock is visible to park visitors. The remaining cinders were used to pave the nearby parking lot.

The Tabor cinder cone is part of the Boring Lava Field, an extensive network of cinder cones and small shield volcanoes ranging from Boring, Oregon, to southwest Washington, and dating to the Plio-Pleistocene era. The lava field has been extinct for over 300,000 years. Three other cinder cones from this field also lie within the city of Portland: Rocky Butte, Powell Butte, and Kelly Butte.

Portland is one of six cities in the United States to have an extinct volcano (Mount Tabor) within its boundaries. Bend is the only other city in Oregon with a volcano within its city limits, with Pilot Butte. Jackson Volcano in Jackson, Mississippi, Diamond Head in Honolulu, Glassford Hill in Prescott Valley, Arizona and Pilot Knob in Austin, Texas being the others.

The volcanic nature of Mount Tabor became known in 1913, when a road-building crew discovered traces of volcanic cinders in the park.

The land making up the Mount Tabor volcanic butte was identified as a site for reservoirs in the 1880s due to its ideal elevation for a water distribution system. The Mount Tabor reservoirs were built during the period of 1894 and 1911, along with reservoirs in Washington Park. City fathers formed a water committee and created a municipal water system piping water some 25 miles from the Bull Run River watershed, separate and west of Mount Hood, to Mount Tabor reservoirs and across the Willamette River to City Park (now Washington Park) reservoirs in 1894. The Bull Run watershed was among the first federal lands to be set aside in the Forest Reserve Act of 1891 and enacted by president Benjamin Harrison.

The reservoirs and their gatehouses are artistically constructed, incorporating extensive reinforced concrete, designed to look like stonework, by two early patented techniques by noted engineer Ernest L. Ransome and wrought-iron fencing and lampposts designed by architect William M. Whidden. There were initially four above-ground reservoirs, numbered 1, 2, 5, and 6. (Reservoirs 3 and 4 are at Washington Park, and Reservoir 7 is a small underground reservoir near Mount Tabor's summit.) Reservoir 2, on the corner of SE 60th and Division, was decommissioned in the 1980s, and the property was sold to a private developer. Its gatehouse remains, and is used as a private residence. Reservoir 6 is the largest, with two 37 million gallon chambers; it also contains a fountain, which was unused for many years; however, it was reactivated in early 2007. Three of the reservoirs were accepted to the National Register of Historic Places in January 2004. The reservoirs' nomination was also a community effort spearheaded by the Friends of the Reservoirs and funded by donations.