Iain David Johnston (born 1965) is a United States district judge of the United States District Court for the Northern District of Illinois and a former United States magistrate judge of the same court.

- Gender
- Male
- Race
- White
Prior employment
- Private practice, Chicago, Illinois1999–2013
- Illinois Drycleaners Environmental Response Trust Fund CouncilAdministrative law judge · 2005–2013
- Illinois State PoliceAdministrative law judge · 2006–2013
- Northeast Illinois Commuter Railroad Corp.Board counsel · 2010–2013
Adjunct professor · 1996–1999, 2008, 2010, 2012- Illinois Department of InsuranceAdministrative law judge · 2006
- Waubonsee Community CollegeGeneral counsel · 1998–1999
State of IllinoisAssistant attorney general · 1993–1998- Private practice, Rockford, Illinois1992–1993
- Illinois Appellate Court, Second DistrictLaw clerk , Hon. Philip G. Reinhard · 1990–1992
Law clerk , Hon. Philip G. Reinhard · 1992- Illinois Circuit Court, Cook CountyLaw clerk , Hon. Thomas E. Hoffman · 1990
Appointments
2020–present · Appointed by Donald J. Trump (Republican)
Education

- Rockford CollegeB.S. · 1987