1 Combat Engineer Regiment[note 1] (1 CER, French: 1er Régiment du génie de combat) is a Regular Force regiment of the Royal Canadian Engineers (RCE) commanded by a lieutenant-colonel.

Its headquarters is in the Patton Building at CFB Edmonton (Steele Barracks), Alberta, and it is assigned to 1 Canadian Mechanized Brigade Group.

1 CER was continually involved with rotations to Afghanistan as part of the ongoing War on Terror.

Due to the regiment's special armoured engineer capability, every Canadian rotation since 2006 had a minimum of an armoured troop from 1 CER attached.

1 CER had six soldiers killed in Afghanistan.