A suggestion box is a device for obtaining additional comments, questions, and requests. In its most basic and traditional form, it is a receptacle with an opening, not unlike an offering box or voting box. The box is used for collecting slips of paper with input from customers and patrons of a particular organization.

Suggestion Box was a short propaganda film produced in 1943 by the Office of War Information. Its purpose was to encourage workers to send in suggestions for more effective war production.