![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png)
Look up jsi in Wiktionary, the free dictionary.
JSI may refer to:
- Japan Science Institute, now IBM Research – Tokyo, a Japanese research lab
- John Shea Insurance Canada Cup Qualifier, a former Canadian curling bonspiel
- John Snow, Inc, an American public health research and consulting firm
- Skiathos Island National Airport, in Greece
- Jožef Stefan Institute, a scientific institute located in Ljubljana, Slovenia