Isotope 217

{{about|the band|nuclear chemical isotopes|217 (disambiguation)}}

{{Use mdy dates|date=April 2025}}

{{Infobox musical artist

|name = Isotope 217°

|image =

|caption =

|background = group_or_band

|origin = Chicago, Illinois, United States

|genre = Jazz-funk, jazz fusion

|years_active = 1997–present |

|label = Thrill Jockey
Aesthetics

|associated_acts = Tortoise
Chicago Underground Duo
Chicago Underground Orchestra

|website =[http://www.thrilljockey.com/artists/?id=10040/ Thrill Jockey: Isotope 217°]

|current_members = Dan Bitney
John Herndon
Rob Mazurek
Jeff Parker
Sara P. Smith
Matthew Lux|

}}

Isotope 217° is a Chicago-based band composed mainly of members from Tortoise and the Chicago Underground Orchestra that was formed in 1997. The New York Times described the band as "...adept to varying degrees at rock and funk and jazz and electronics, turn those introspective moments into jams that are messier and warmer than Tortoise's."{{cite news|first=Ben|last=Ratliff|date=2001-01-22|accessdate=2007-04-02|title=POP REVIEW; Trading Roles While Stirring The Sound|work=The New York Times|url=https://query.nytimes.com/gst/fullpage.html?res=9500E6DF133CF931A15752C0A9679C8B63}}