RustBCA is a general-purpose, high-performance, Binary Collision Approximation (BCA) code for simulating ion-material interactions, written in Rust. BCA codes discretize the interactions of energetic ions with materials into a series of binary collisions, drastically reducing the computational cost of simulating the physical process of sputtering, implantation, and reflection. RustBCA can operate as a standalone program for simulating ion-material interactions, or as a library via C++ and Python bindings for coupling to plasma and/or material codes.