Adjuncts play a major role in undergraduate geoscience instruction, especially for introductory courses, which are crucial to recruiting and retaining geoscience majors, recruiting a diverse population to geoscience majors, and for scientific literacy for everyone. However, many adjuncts have little or no formal training in teaching college courses and are unaware of best teaching practices. This round table discussion will provide a forum for the community to identify barriers for adjuncts, identify and explore new and existing approaches to geoscience adjunct training and professional development, identify ways that the geoscience community can support adjuncts, and explore ways to determine the effectiveness of geoscience adjunct training.