A cowboy is an animal herder who tends cattle on ranches in North America, traditionally on horseback, and often performs a multitude of other ranch-related tasks. The historic American cowboy of the late 19th century arose from the vaquero traditions of northern Mexico and became a figure of special significance and legend. A subtype, called a wrangler, specifically tends the horses used to work cattle. In addition to ranch work, some cowboys work for or participate in rodeos. Cowgirls, first defined as such in the late 19th century, had a less-well documented historical role, but in the modern world work at identical tasks and have obtained considerable respect for their achievements. Cattle handlers in many other parts of the world, particularly South America and Australia, perform work similar to the cowboy.

The cowboy has deep historic roots tracing back to Spain and the earliest European settlers of the Americas. Over the centuries, differences in terrain and climate, and the influence of cattle-handling traditions from multiple cultures, created several distinct styles of equipment, clothing and animal handling. As the ever-practical cowboy adapted to the modern world, his equipment and techniques also adapted, though many classic traditions are preserved.