A hoodie (also called a hooded sweatshirt or hoody) is a sweatshirt with a hood. The characteristic design includes large frontal pockets, a hood, and (usually) a drawstring to adjust the hood opening. They are sometimes worn with sweatpants. Some hoodies have zippers on them to allow easy removal much like a jacket. These hoodies are sometimes called zip-up hoodies or just a jacket.

The term hoodie entered popular usage in the 1990s. The history of the specific garment began in the 1930s, but historical precedent dates the style and form of the hoodie back to the Middle Ages. The formal wear for Catholic monks included a cowl, a long, decorative hood worn in addition to the standard tunic or robes. The modern clothing style was first produced by Champion in the 1930s for laborers in the frozen warehouses of New York. Its popularity spread as sportswear designers such as Claire McCardell developed entire collections based around the clothing.

The hoodie took off in the 1970s, with several factors contributing to its success. Hip hop culture developed in New York City around this time, and the hoodie's element of instant anonymity, provided by the accessible hood, appealed to those with criminal intent. High fashion also contributed during this era, as Norma Kamali and other high-profile designers embraced and glamorized the new clothing. Most critical to the hoodie's popularity during this time was its iconic appearance in the blockbuster Rocky film. By the 1990s, the hoodie had evolved into a symbol of isolation, a statement of academic spirit, and several fashion collections.[citation needed] The association with chavs/neds in the UK developed around this time, as their popularity rose with that specific demographic. Young men, often skateboarders or surfers, sported the hoodie and spread the trend across the western United States, most significantly in California. The rise of hoodies with university logos began around this time. Tommy Hilfiger, Giorgio Armani, and Ralph Lauren, for example, used the hoodie as the primary component for many of their collections in the 1990s. In May 2005, at a time of recent publicity surrounding "Hoodies" in shopping centres, an infant travel wrap called the "Baby Hoodie" was launched by Morrck, a small UK company run by 'Mum-preneurs'. Towards the late 2000s and 2010s, the hoodie has become increasingly popular with male youths in Australia.

In Saskatchewan, the hoodie is often known as a "bunny hug" or "bunnyhug". Now being very popular with youth culture - Scene Kids - it shaken off it's dark meaning and is fun way of implementing cartoon features (kawaii, anime) in the outfit, e.g. monster eyes and spikes or kitty ears on Hoodie.