Waiting staff (British English), waitstaff (North American English), waiters (male) / waitresses (female), or servers (North American English), are those who work at a restaurant, a diner, or a bar and sometimes in private homes, attending to customers by supplying them with food and drink as requested. Waiting staff follow rules and guidelines determined by the manager. Waiting staff carry out many different tasks, such as taking orders, food-running, polishing dishes and silverware, helping bus tables and restocking working stations with needed supplies.

Waiting on tables is part of the service sector and among the most common occupations in the United States. The Bureau of Labor Statistics estimates that, as of May 2008, there were over 2.2 million people employed as servers in the U.S.

Many restaurants choose a specific uniform for their waiting staff to wear. Waiting staff may receive tips as a minor or major part of their earnings, with customs varying widely from country to country.