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San Buenaventura, commonly referred to as Ventura, is the county seat of Ventura County, California, United States, incorporated in 1866. Ventura has a population of 106,744. Ventura is accessible via U.S. Route 101, State Route 33, and State Route 126.

Father Junípero Serra founded Mission San Buenaventura in 1782, forming the basis of what would become the city. The mission was named for St. Bonaventure, a Thirteenth Century Franciscan saint and a Doctor of the Church. On July 6, 1841, Governor Juan Bautista Alvarado granted the 4,694 acre (1,900 ha) Rancho San Miguel to Felipe Lorenzana and Raimundo Olivas, whose Olivas Adobe on the banks of the Santa Clara River was the most magnificent hacienda south of Monterey.

After the American Civil War, settlers came to the area, buying land from the Mexicans, or simply as squatters. Vast holdings were later acquired by Easterners, including the railroad magnate, Thomas Scott. He was impressed by one of the young employees, Thomas R. Bard, who had been in charge of train supplies to Union troops, and Bard was sent west to handle Scott's property.

Not easily accessible, Ventura was not a target of immigrants, and as such, remained quiet and rural. For most of the century which followed the incorporation of Ventura in 1866, it remained isolated from the rest of the state.

Bard is often regarded as the Father of Ventura and his descendants have been prominently identified with the growth of Ventura County. The Union Oil Company was organized with Bard as President in 1890, and has offices in Santa Paula. The main Ventura oil field was drilled in 1914 and at its peak produced 90,000 barrels per day (14,000 m3/d). The city is located between the Ventura River and the Santa Clara River, leading to soil so fertile that citrus grew better here than anywhere else in the state. The citrus farmers formed Sunkist Growers, Incorporated, the world's largest organization of citrus production.

From the south, travel by auto was slow and hazardous, until the completion of a four-lane freeway (US Highway 101) over the Conejo Grade in 1959. This route, now further widened and improved by 1969, is known as the Ventura Freeway, which directly links Ventura with the Los Angeles metropolitan area. Another route, US Highway 101 ALT (now the Pacific Coast Highway) traveled along the coast from Santa Monica via Oxnard, but was not heavily used.

From the north, entrance was by way of a single road along the beach and stagecoach passengers either had to wait until low tide when the horses could cross on the exposed wet sand, or go up the Ventura River Valley and then cross over the mountains to Santa Barbara via Casitas Pass, a long and difficult trip.

Inland, Ventura was hemmed in by (what is now) the Los Padres National Forest, composed of mountainous country and deep canyons. This route became passable with the completion of the Maricopa Highway (Hwy 33) in the 1930s.

Since then, Ventura has grown steadily. In 1920 there were 4,156 people. In 1930 the population had increased to 11,603, by 1950 the population reached 16,643, by 1970 the population was 57,964, and in 1980 the population had increased to 73,774. In the last three decades it has increased to approximately 105,000.

Ventura has some of the best surfing in Southern California, especially Surfer's Point at Ventura County Fairgrounds. Downtown Ventura is home to the Mission San Buenaventura, museums, galleries, dining, and shopping. Primary areas of activity include California Street and Main Street between Ventura Avenue and Fir Street. Located in downtown is the historic Ortega Adobe, home to the Ortega family, now famous for their chile products. Numerous thrift stores contrast with high-end shops and restaurants. Downtown Ventura is also home to the Ventura's ornate city hall building with its signature statue of Junipero Serra. Downtown now features numerous restaurants, winebars and the Internationally acclaimed Rubicon Theatre Company. For shopping and nightlife, downtown is the place to go. Ventura Avenue is also a major point of interest that attracts tourists.

A 4,300-square-foot (400 m2) Ventura Visitors Center is located at 101 S. California Street, in downtown and features exhibits on the Heritage Valley, Channel Islands National park, local arts scene and maps and guide books on the area.

One of the most recognizable land marks in Ventura is a site known as two trees. These are two lone trees that stand on a hill and can be seen from most of Ventura.

In Plaza Park (Chestnut and Santa Clara Streets, downtown) one of the nations largest Moreton Bay Fig Trees is marked with an historic plaque. Across the street is the main post office with WPA murals on its interior walls.

The Ventura Harbor is home to fishing industry, seafood restaurants and a shopping village at Ventura Harbor Village. The Channel Islands National Park Headquarters is also located in this harbor, and boats to the Channel Islands depart from there daily.