Marcela Carena (born March 22, 1962 in Buenos Aires, Argentina) is a theoretical physicist at the Fermi National Accelerator Laboratory and a professor at the University of Chicago and the Enrico Fermi Institute. She is the Director of International Relations at Fermilab, as well as the head of the Theoretical Physics Department. As of January 1, 2016 she is the Chair Elect of the Division of Particles and Fields of the American Physical Society.