The 23d CBRN Battalion is a Chemical, biological, radiological, nuclear and high-yield explosives defense battalion of the United States Army, part of the 2ID Sustainment Brigade of the 2nd Infantry Division at Camp Humphreys, Korea.

It traces its lineage back to the 1944 formation of the 23rd Chemical Smoke Generator Battalion in England during World War II.

In a 4 April 2013 ceremony, the 23d Chemical Battalion was officially transferred back to Korea after spending eight years at Joint Base Lewis–McChord.

[2] The 23d CBRN Battalion is currently composed of:[3] As of 10 June 2013, the following companies were reassigned from the 23rd CBRNE BN.

This article incorporates public domain material from Lineage and Honors of the 23d Chemical Battalion.