Case salience affects nearly every aspect of Supreme Court justices’ behavior, yet a valid actor-based measure of salience has remained elusive. Researchers have instead relied on external proxy indicators, such as amicus curiae participation and media coverage, to explain justices’ behavior. We propose a novel measurement of salience in which we use justices’ differential levels of engagement to generate actor-based measures of case and justice-level salience. Focusing on justices’ behavior during oral argument, we contend that the more engaged the justices are in a case—defined by the number of words they speak—the more salient the case.