RSI

RSI may refer to:

Repetitive strain injury, a disorder affecting bone and muscle from repetitive movements
Research Science Institute, a summer research program held at MIT for rising high school seniors
Rapid sequence induction, a form of anæsthesia
Relative strength index, a security market indicator
Radiotelevisione svizzera di lingua italiana, a Swiss radio broadcaster
Italian Social Republic, Repubblica Sociale Italiana
Revenue and Social Insurance number, in the Republic of Ireland
Residual self image, the self-projected image of oneself inside The Matrix
Religious Science International, an organization in Religious Science
Red Sector Incorporated, a demogroup
Review of Scientific Instruments (title of a scientific journal)