The Olmsted Brothers company was an extremely influential landscape design firm in the United States, formed in 1898 by step-brothers John Charles Olmsted (1852-1920) and Frederick Law Olmsted, Jr. (1870-1957), who had inherited the nation's first landscaping practice from their father, Frederick Law Olmsted. The two brothers were also among the founding members of the American Society of Landscape Architects , and played an influential role in creating the National Park Service.

The Olmsted Brothers completed numerous high-profile projects, many of which remain popular to this day, including park systems, universities, exposition grounds, libraries, hospitals, and state capitols. Notable commissions include the United States Capitol and White House Grounds, Great Smoky Mountains and Acadia National Parks, Yosemite Valley, New York's Central Park, and entire park systems in cities such as Seattle, Boston and Louisville. The firm employed nearly 60 staff at its peak in the early 1930s. Notable landscape architects in the firm included James Frederick Dawson. The last family member in the firm, Frederick Law Olmsted, Jr., retired in 1949.

"Fairsted", the firm's 100 year old business headquarters and design office, has been carefully preserved as the Frederick Law Olmsted National Historic Site , located on 7 acres of landscaped grounds at 99 Warren St., Brookline, Massachusetts. It offers excellent insights into the actual practice of large-scale landscape design and engineering.

Selected Olmsted Brothers landscape designs

• Elm Bank Horticulture Center
• Fresh Pond, Cambridge, Massachusetts
• Pope Park, Hartford, Connecticut