IL-1 may refer to:
*
Interleukin 1
The Interleukin-1 family (IL-1 family) is a group of 11 cytokines that plays a central role in the regulation of immune and inflammatory responses to infections or sterile insults.
Discovery
Discovery of these cytokines began with studies on t ...
, a protein
*
Illinois's 1st congressional district
Illinois's first congressional district is a congressional district in the U.S. state of Illinois. Based in Cook County, the district includes much of the South Side of Chicago, and continues southwest to Joliet.
From 2003 to early 2013 it ext ...
*
Illinois Route 1
Illinois Route 1 (IL 1) is a state highway in the U.S. state of Illinois. Running parallel to the Indiana border, the highway starts at the free ferry crossing to Kentucky at Cave-in-Rock on the Ohio River and runs north to the south sid ...
* Building 1 of
Infinite Loop (street)
The Apple Campus is the former corporate headquarters of Apple Inc. from 1993 until 2017, when it was largely replaced by Apple Park, though it is still used by Apple as office and lab space. The campus is located at 1 Infinite Loop in Cupertino ...
, the headquarters of Apple Inc.
*
Ilyushin Il-1, a Soviet fighter prototype
{{Letter-NumberCombDisambig