Barbara Johnstone (born March 24, 1952) is an American professor of rhetoric and linguistics at Carnegie Mellon University. She specializes in discourse structure and function, sociolinguistics, rhetorical theory, and methods of text analysis. She was the editor in chief of Language in Society from 2005 to 2013, and is the editor of Pittsburgh Speech & Society, a website about Pittsburgh English for non-linguists. She has published several books, including Speaking Pittsburghese (2013) and Discourse Analysis, 2nd Ed. (2008). She has also written for The New York Times.