Borgarhreppur () was formerly a rural parish (hreppur) in Mýrasýsla county, west Iceland, named after the ancient farm and church estate Borg á Mýrum which was occupied by SkallagrÃÂmur Kveldúlfsson, one of Iceland's original settlers.
On 7 June 1998, Borgarhreppur joined the Borgarbyggð municipality, along with ÃÂlftaneshreppur and ÃÂverárhlÃÂðarhreppur.