Gullinborsti (Old Norse: *Gullinbursti, *Gullinbyrsi, *Gúlimborsti, also Sliðrugtanni) meaning "the one with the golden bristles" is the name of the boar of the Norse god Freyr.
The name Gullinborstis mentioned in writing by the Old Icelandic skald/poet and historian Snorri Sturluson in his works Gylfaginning 48 and Skáldskaparmál 7.
According to Norse mythology, Gullinborsti is Freyr's faithful companion, pulling his cart through the air and over water by day and night.
In the darkness, his golden bristles spray sparks of fire that illuminate the darkness. Gullinborsti was made by the dwarves Sindri and Brokkr.
The boar also appears as a revered animal in other mythologies.
