| Unit Name: | 4 Engineer Support Regiment |
| Dates: | 1977–present |
| Country: | Canada |
| Branch: | Canadian Army |
| Type: | Engineering support |
| Size: | Four squadrons. 450 pers (approx) |
| Command Structure: | 6 Canadian Combat Support Brigade |
| Garrison: | 5 CDSB Gagetown |
| Website: | https://www.canada.ca/en/army/corporate/5-canadian-division/4-engineer-support-regiment.html |
| Commander1: | LCol A. Poirier, CD |
| Commander1 Label: | Commanding officer |
| Commander2: | LCol W. Dixon, CD |
| Commander2 Label: | Previous commanding officer |
| Commander3: | Maj M. Littlechild, CD |
| Commander3 Label: | Deputy commanding officer |
| Commander4: | CWO F.W. Cross, CD |
| Commander4 Label: | Regimental sergeant major |
| Commander5: | Capt D. Portelli |
| Commander5 Label: | Adjutant |
| Identification Symbol: | |
| Identification Symbol Label: | NATO Map Symbol |
| Identification Symbol 4: | 4 ESR |
| Identification Symbol 4 Label: | Abbreviation |
4 Engineer Support Regiment (French: links=no|4<sup>e</sup> Régiment d'appui du génie) is a regiment of the Canadian Military Engineers headquartered at CFB Gagetown, New Brunswick. It is tasked to provide general engineer support to the whole of the Canadian Armed Forces.[1] [2]
4 ESR was officially formed in 1993 when 4 Combat Engineer Regiment (4 CER) returned from CFB Lahr in Germany when 4 Canadian Mechanized Brigade Group was stood down. 4 CER absorbed 22 Field Squadron, a detached and independent unit affiliated with 2 Combat Engineer Regiment. 22 Field Squadron was stationed in CFB Gagetown supporting the 2nd Battalion The Royal Canadian Regiment Battle Group, the Combat Training Centre and 4 CER in Germany.
On 1 June 2022, the perpetuation of No. 2 Construction Battalion of the First World War Canadian Expeditionary Force was assigned to the Canadian Military Engineers, with 4 Engineer Support Regiment being responsible for ongoing public recognition of the perpetuation.[3]
The unit currently consists of: