Ryszard Iwon Terlecki is a Polish politician, the Parliamentary Caucus Head of the Law and Justice party between 2015–2023. Terlecki, a historian and professor of humanities, lectures at the Pontifical University of John Paul II. He is a member of the Sejm, serving since 2007. He served as the Deputy Marshal of the Sejm of the Republic of Poland 2015–2023.