Equity in teacher development means that all students have a right and a need to be exposed to excellent teaching. This is dependent on ensuring that all teachers have access to high-quality professional learning. This article discusses both what Learning Forward means when using the term "equity" and why examining equity is crucial to developing high-quality professional learning. Equality is one possible outcome of an equitable system, and often it is the primary outcome sought. However, there are many equitable processes that lack equality in design or implementation. The outcome being sought is one that moves us toward a fair, just educational system. This article discusses how ensuring that all teachers have access to high-quality professional learning looks in practice at Momentous Institute in Dallas, Texas.