The gleaming white elf-horse ridden by Glorfindel of Rivendell in the closing years of the Third Age. It was on Asfaloth that Glorfindel set out to seek Aragorn and the Hobbits, and after they had been found, the Elf gave up his mount to the wounded Frodo. Despite a dangerous encounter with the Black Riders at the Ford of Bruinen, Asfaloth brought Frodo safely to the House of Elrond.

In the first edition of The Lord of the Rings, Asfaloth was described as being fitted with a bridle and bit, even though it's elsewhere established that Elves did not use bridles. After a letter from a curious reader, Tolkien acknowledged this inconsistency, and later editions read 'headstall' rather than 'bridle and bit'. In the relevant letter, we're given a little more detail about Asfaloth's gear: 'Glorfindel's horse would have an ornamental headstall, carrying a plume, and with the straps studded with jewels and small bells, but Glor[findel] would certainly not use a bit' (The Letters of J.R.R. Tolkien, No. 211, dated 1958).