Abstract: A modular operator interface system may include a controller and first and second interface modules configured to be installed along opposed left and right sides, respectively, of a steering assembly of a work vehicle. The first interface module may include a first module housing and a plurality of first interface elements supported by the first module housing. The first interface elements include one or more first EH-related interface elements configured to provide an operator input(s) to the controller associated with one or more first EH-based control functions for the work vehicle. The second interface module may include a second module housing and a plurality of second interface elements supported by the second module housing. The second interface elements include one or more second EH-related interface elements configured to provide an operator input(s) to the controller associated with one or more second EH-based control functions for the work vehicle.