The photochemistry community encompasses investigators from diverse scientific backgrounds examining a broad range of issues that arise when light interacts with molecular systems. Reflecting this diversity, the 2021 Gordon Research Conference on Photochemistry will highlight the extended reach of light-driven methods and processes with a particular emphasis on its interdisciplinary nature. The program will feature research spanning organic, inorganic, biological, and materials systems, a range of experimental and theoretical methods and timescales from ultrafast to ultraslow, as well as highlighting the latest applied research on cross-disciplinary topics like photomedicine, solar energy conversion, multidimensional spectroscopies, and photoredox catalysis to name a few. Discussion leaders will set the stage for each session by presenting an overview of the area represented in that session in an effort to provide useful context for those from different disciplines and to foster a dynamic, inclusive environment for scientific discussion. Interactions among investigators will be emphasized, with ample time set aside for informal scientific exchanges following talks and at the poster sessions.