A kosovorotka (Russian: косоворотка) is a Russian, skewed-collared shirt. The word is derived from koso - askew, and vorot collar.

A kosovorotka is a traditional Russian shirt, long sleeved and reaching down to the mid-thigh. The shirt is not buttoned all the way down to the hem, but has several buttons at the collar (unfastened when the garment is pulled over the wearer's head), though these are positioned off to one side (regional styles vary between left and right), instead of centrally, as is customary with a typical Western 20th and 21st century man's shirt. If left unbuttoned the collar appears skewed, which accounts for the garment's name. The collar and sleeves of kosovorotka were often decorated with a traditional Slavic ornament.

Today kosovorotka are perceived mostly as men's shirts. However, the shirts for women and children are not too much different from the men's variant, and the word kosovorotka in fact is often used to denote just any kind of shirt. The men's garment was worn loose and was not tucked into the trousers, but instead belted either with a conventional belt, a rope, or a rope-like tie. The tails of the garment hung over the trousers. Women's shirts were tucked into the skirt or worn under the sarafan, and indeed tended to have a straighter collar. Children's shirts were often too long for those who wore them, and was the only piece of clothing on little boys and girls in the ancient times.