Annual leave is paid time off work granted by employers to employees to be used for whatever the employee wishes. Depending on the employer's policies, differing number of days may be offered, and the employee may be required to give a certain amount of advance notice, may have to coordinate with the employer to be sure that staffing is adequately covered during the employee's absence, and other requirements may have to be met. It is considered a benefit for the employees.

Most countries around the world have labor laws that mandate employers give a certain number of paid time-off days per year to workers. Nearly all Canadian provinces require at least two weeks; in the European Union the countries can set freely the minimum, but it has to be at least 20 days (plus the national holidays, so the total is usually more than 30 days, 5 full weeks plus holidays in France). Full time employment in Australia requires twenty annual leave days a year. US law does not require employers to grant any vacation or holidays, and about 25% of all employees receive no paid vacation time or paid holidays. Many US State and local governments require a minimum number of days off; for employees that do receive vacation in the U.S., ten working days with eight national holidays is fairly standard. Members of the U.S. Armed Services earn 30 vacation days a year, not including national holidays.