UCSF Chimera (or simply Chimera) is an extensible program for interactive visualization and analysis of molecular structures and related data, including density maps, supramolecular assemblies, sequence alignments, docking results, trajectories, and conformational ensembles.

Chimera includes complete documentation and can be downloaded free of charge for noncommercial use.

Chimera is developed by the Resource for Biocomputing, Visualization, and Informatics (RBVI) at the University of California, San Francisco.

Development is partially supported by the National Institutes of Health (NIGMS grant P41-GM103311).

The next-generation program is UCSF ChimeraX.