Paul Cornell (August 5, 1822 – March 3, 1904) was an American lawyer and Chicago real estate speculator who founded the Hyde Park Township that included most of what are now known as the south and far southeast sides of Chicago in Cook County, Illinois, United States. He turned the south side Lake Michigan lakefront area, especially the Hyde Park community area and neighboring Kenwood and Woodlawn neighborhoods, into a resort community that had its heyday from the 1850s through the early 20th century. He was also an urban planner who paved the way for and preserved many of the parks that are now in the Chicago Park District. Additionally, he was a successful entrepreneur with interests in manufacturing, cemeteries, and hotels.

His modern legacy includes several large parks now in the Chicago Park District: Jackson Park, Washington Park, Midway Plaisance and Harold Washington Park. Most of the South and Southeast Sides of Chicago were developed and eventually annexed into the City of Chicago as a result of his foresight. A lengthy street and a park both bear his name.

Born in Upstate New York, Cornell was from a distinguished New England family, was descendant from Thomas Cornell, the progenitor of the Cornell family in North America, and a cousin to Ezra Cornell, founder of Cornell University. When his father died (he was 10 months old at that time) the family moved to the Adams County, IL/Schuyler County, IL area, where he worked as a farmhand to pay for schooling. He passed the Illinois bar examination and moved to Chicago in 1847. Unfortunately, his entire savings was stolen from his hotel room on his first night in town. A sympathetic lawyer provided him with both a loan and a job at the law office of Skinner and Hoyne, where he met Senator Stephen Douglas.

He was married to the sister-in-law of John Evans, after whom Evanston, IL was named. He had many strong local connections, being related to founders of Northwestern University (Evans and Orrington Lunt) and to George Kimbark of Riverside Improvement Company. His brother-in-law Kimbark purchased the area between 51st and 55th and Dorchester and Woodlawn to the west of Cornell's purchase. Cornell later purchased this as well as other lands purchased by his uncle, Hassan A. Hopkins, to add to Hyde Park.

Douglas advised him to consider investing in land south of the city limits. After some horseback travels through the area, he began to envision a viable community there. In 1853, following the advice of Douglas, he bought 300 acres (1.21 km²) of property between 51st Street and 55th Street as a speculative investment. This area was 7 miles (11.27 km) south of the mouth of the Chicago River and 6 miles (9.66 km) south of downtown Chicago. In the 1850s, Chicago was still a walkable urban area well contained within a 2 miles (3.22 km) radius of the center. It was common for development companies to locate hotels near rail depots to introduce visitors to new suburbs. In 1856, Paul Cornell invented the Chicago railroad suburb. In an effort to improve his land value, he deeded 60 acres (0.24 km²) to the Illinois Central Railroad in exchange for a 53rd Street train station and a commitment of 6 daily connections to Chicago's Central Depot in each direction. He then marketed the neighborhood to wealthy Chicagoans as a resort area. He selected the name Hyde Park to associate the area with the elite high class neighborhoods of New York and London.

At about the same time, he built the Hyde Park House a 4-story hotel at 53rd Street and Lake Michigan. The hotel became the focal point of the community and drew affluent guests with leisure time and discretionary income. This site is now occupied by the Hampton House. The hotel also helped others to envision a thriving affluent community in the area. By 1861, the residents petitioned the Illinois General Assembly to create the Hyde Park Township.

Paul Cornell specifically forbade heavy industry development in Hyde Park. He maintained the character of Hyde Park, which was intended to be an elite suburb bordering Chicago, by selling only large lots that the affluent could afford. The neighborhood flourished for the next two generations.

In 1889, the entire Hyde Park township (the area south of 39th Street, north of 138th Street, and east of State Street), which had quintupled in population from an 1880 population of 15,716 to an 1889 population of 85,000, voted for annexation to the City of Chicago. Paul Cornell planned and advocated a town with a lakefront park, a plaisance, an adjoining park and boulevards shaped the town. His plan for a cornerstone institution to rival Evanston's Northwestern University was at first thwarted by the decision to establish a theological seminary on the north side, but would come to fruition with the foundation of the University of Chicago through the philanthropy of John D. Rockefeller and Marshall Field in 1890.