Gilfillan Brothers, later known as ITT-Gilfillan, was an American electronics company located in Los Angeles, best known for their radar systems. They changed names several times, and might be referred to as ITT Corporation Electronic Systems Radar Systems - Gilfillan or ITT Industries, Gilfillan Division, depending on the source. They were spun off by ITT in 2011 to form a division of the newly created Exelis Inc. Exelis was in turn purchased in 2015 by Harris Corporation and then merged in 2019 to become part of L3Harris Technologies.