The Leedy Manufacturing Company (also known as the Leedy Drum Company) was an American manufacturer of percussion instruments headquartered in Indianapolis, Indiana. Leedy was highly successful in the early twentieth century, and was at one point the largest manufacturer of drums and other percussion instruments in the world.

The company was formed by Ulysses. G. Leedy as the Leedy-Cooley Manufacturing Company with partner Sam Cooley in 1897 before the partnership was dissolved in 1902 to become simply the Leedy Manufacturing Company. It was purchased by C. G. Conn of Elkhart, Indiana, where it was later combined with Ludwig & Ludwig to form Leedy & Ludwig. When C. G. Conn sold its drum divisions, the Slingerland Drum Company bought the rights to Leedy and produced drums under its badge until the 1960s. Slingerland was ultimately purchased by Gretsch, and with it, Leedy, where the brand has lain relatively dormant since.

The company was responsible for many innovations in percussion but is best known for the invention of the vibraphone and the creation of the Purdue Big Bass Drum.

Ulysses G. Leedy was born in 1867 in Hancock County, Ohio before his family moved to Fostoria, Ohio. When Leedy was seven years old, his mother purchased a drum for him from an old Civil War veteran. Leedy took a liking to the instrument, later joining the 15th Regimental Drum Corps as a teenager and the Fostoria town band and orchestra as a young adult. After being seen playing a xylophone solo with the town band, he was asked to join the Great Western Band at Cedar Point by their business manager. After playing with the group for three years, Leedy started taking on theater gigs and traveled the nation. After taking the job as a trap set player for the English Hotel and Opera House, Leedy settled in Indianapolis.

During his travels, Leedy began to make drums and hardware for himself and his peers as different musical needs arose. Starting in 1895, Leedy and his roommate, Sam Cooley (a clarinetist for the English Hotel and Opera House orchestra), sold drums out of their apartment. In 1897, and with only fifty dollars between the duo, they bought a room in the basement of the old Indianapolis Cyclorama Building and formally established themselves as the Leedy-Cooley Manufacturing Company. One of the more popular products of Leedy-Cooley was an adjustable snare drum stand, the first of its type, that Leedy had patented in 1899.

In 1902, the partnership was dissolved and the Leedy Manufacturing Company was established as a corporation between Herman E. Winterhoff, Charles B. Wanamaker, and Leedy. Winterhoff served as a tuner for the keyboard percussion division and was the vice president of the company, while Wanamaker served as secretary-treasurer. Wanamaker was successful as a designer, having worked as an engineer and business owner in the Cyclorama Building (where he met Leedy) prior to joining the company. During his tenure, he helped Leedy develop and patent an early snare drum strainer that allowed the wires to be moved away from the bottom head as a single unit. Wanamaker retired at the age of seventy in 1920 but remained one of the largest shareholders until the company was acquired by C. G. Conn in 1929.

Leroy Jefferies, who would become the company's longest employee, was one of the original stockholders. He first worked as a mechanic for the factory, later becoming the chief engineer and foreman of the plant. The next year, in 1903, the Cyclorama Building was demolished, and Leedy built his first factory at the corner of Palmer Street and Barth Avenue.

Expansions were made to the factory in 1910 and 1920, topping out at around 78,450 square feet (7,288 m²). At the height of production, the Leedy factory had over twenty departments, from a lumberyard and tannery to art and plating departments.