Virginia Vassilevska Williams (née Virginia Panayotova Vassilevska) is a theoretical computer scientist and mathematician known for her research in computational complexity theory and algorithms. She is currently the Steven and Renee Finn Career Development Associate Professor of Electrical Engineering and Computer Science at the Massachusetts Institute of Technology. She is notable for her breakthrough results in fast matrix multiplication, for her work on dynamic algorithms, and for helping to develop the field of fine-grained complexity.