A Master Arborist is an individual who has achieved the highest level of certification and expertise in the field of arboriculture. Becoming a Master Arborist typically requires extensive experience, education, and passing rigorous examinations administered by professional arborist organizations such as the International Society of Arboriculture (ISA).

Master Arborists possess advanced knowledge and skills in tree care, risk assessment, tree biology, pruning techniques, pest and disease management, tree preservation, and other aspects of arboriculture. They often serve as leaders in their field and may be involved in consulting, research, teaching, and training other arborists.