This book represents a selection of papers presented at the Inductive Logic Programming (Ilp) workshop held at Cumberland Lodge, Great Windsor Park. The collection marks two decades since the first Ilp workshop in 1991. During this period the area has developed into the main forum for work on logic-based machine learning. The chapters cover a wide variety of topics, ranging from theory and Ilp implementations to state-of-the-art applications in real-world domains.