A work anniversary, also known as a job anniversary or service anniversary, refers to the annual commemoration of an employee's tenure or time spent working for a particular organization. It signifies the number of years an individual has been employed by the company, starting from their initial date of hire.

What is a work anniversary? A work anniversary is a date that marks the start of an employee’s job at a company. Many companies celebrate their employees’ work anniversaries with parties, gifts, or other celebrations.