Sinthgunt is a figure in Germanic mythology, attested solely in the Old High German 9th- or 10th-century Second Merseburg Charm. In the verse charm, Sinthgunt is referred to as the sister of the personified sun, Sunna (whose name is alliterative to Sinthgunt), and the two sisters are cited as both producing incantations to heal the horse of Phol, another otherwise unattested figure but possibly the same as Balder, who is named elsewhere in the charm. The two are then followed by Friia and Uolla, also alliterative and stated as sisters.
As Sinthgunt is otherwise unattested, her significance is otherwise unknown, but some scholarly theories exist about her role in Germanic mythology based on proposed etymologies and the potential significance of her placement within the poem.