A dishwasher appliance and user interface are generally provided herein. The user interface may be provided on the dishwasher appliance and include a control panel, a button body, a board housing, and a control board. The button body may be slidably mounted to the control panel. The board housing may be disposed behind the control panel along a transverse direction. The board housing may include a planar frame and a resilient cantilever. The planar frame may define a switch aperture in transverse alignment with the button body. The resilient cantilever may extend from the planar frame in forward biased engagement with the button body. The control board may be fixed to the board housing and include a contact switch positioned in transverse alignment with the switch aperture to selectively engage the button body.