Collinwood is a historical area in the northeast part of Cleveland, Ohio. Originally a village in Euclid Township, it was annexed by the city in 1910. Collinwood grew around the rail yards of the Lake Shore and Michigan Southern Railway (now CSX) and is divided by these same tracks into the neighborhoods of North Shore Collinwood and Collinwood–Nottingham. Collinwood was identified as one of America's Best Secret Neighborhoods by Travel + Leisure in 2008.

The neighborhood's most infamous incident antedates its annexation by Cleveland. On Ash Wednesday, March 4, 1908, Collinwood was the site of an event known as the Collinwood School Fire, at Lakeview Elementary School. One of the deadliest school fires in American history, 172 children, two young teachers, and one rescuer died in the fire after being trapped in stairwell vestibules. Originally, the students were thought to be trapped because doors to the school opened inward, but the coroner's report indicated that the doors did indeed open outward. While some of the children died from burns and smoke inhalation, most were either crushed or suffocated in the frantic attempt to escape the building. Those killed in the fire who could not be identified were buried in a mass grave in Cleveland's Lakeview Cemetery. National building standards requiring that doors in public buildings open outward were already in effect, and the fire did result in a trend towards municipalities nationwide adopting policies of school inspections and enforcing stricter building codes.

Annexed by Cleveland in 1912, portions of the Village of Nottingham were rolled into Collinwood.

For much of the 20th century, Collinwood thrived due in large part to heavy industry. Besides the railroad yards, major corporations such as General Motors, which operated its Fisher Body plant on Coit Road and General Electric with its Pitney Glass Works on E. 152nd., employed thousands of workers. By the eve of World War II, Collinwood's economic vitality had drawn large numbers of both ethnic white Europeans and Southern Appalachians. The 1960s had an influx of African Americans, who are today the majority population both in North and South Collinwood.

Collinwood took national center stage in the 1970s during a gang war when the Cleveland Mafia, centered in the Collinwood and Murray Hill neighborhoods, fought a territorial war with the Celtic Club led by Irish gangster Danny Greene. The eventual bombing death of Greene brought the federal organized-crime task force to Cleveland, which after many trials, is said to have crippled the Mafia in Cleveland.

In the 21st century, Collinwood has become a place of interest for artists seeking low-cost urban places to live and work. The housing and foreclosure crisis, though somewhat detrimental to the urban fabric of the neighborhood, has provided opportunities for artists to acquire properties very inexpensively. A collective known as Arts Collinwood has been instrumental in helping to revitalize the Waterloo Road business district on the north side of the neighborhood.

Begun mainly as the residential section, North Shore Collinwood, commonly known as North Collinwood, is bounded roughly between E. 133rd Street to the west and E. 185th Street to the northeast (E.200th street due east), and between Lake Erie to the north and the Collinwood Railroad Yards and tracks (currently operated by CSX to the south, Woodworth Avenue to the southwest, and roughly Roseland Avenue to the southeast. North Collinwood is the location of several parks, including Wildwood Park and Marina, East Shore Park, and Beachland Park, and was the site of historic Euclid Beach Park. The Roman Catholic Villa Angela-St. Joseph High School is located at E. 185th and Lakeshore Boulevard.

What was once the industry-heavy of the two sections, Collinwood–Nottingham, commonly known as South Collinwood, is roughly bounded between E. 134th Street on the west and Euclid Creek on the east, the Collinwood Railroad Yards and tracks to the north, Woodworth Avenue to the southwest, and roughly Roseland Avenue to the southeast. The location of the Five Points, where Ivanhoe Road, St. Clair Avenue, and E. 152nd Street intersect, is the central business district of the neighborhood, and is also the location of Collinwood High School, whose sports teams are aptly named the Railroaders. Although today it is largely African American, South Collinwood has historically been an enclave of European immigrants, as well as migrants from the Southern United States.