Bestla (Old Norse: [ˈbestlɑ]) is a jötunn in Norse mythology, and the mother of the gods Odin, Vili and Vé (by way of Borr). She is also the sister of an unnamed man who assisted Odin, and the daughter (or granddaughter depending on the source) of the jötunn Bölþorn. Odin is frequently called "Bestla's son" in both skaldic verses and the Poetic Edda.

Bestla is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, the Prose Edda, written in the 13th century by Snorri Sturluson, and in the poetry of skalds. Scholars have commented on the obscurity of the figure's name and have proposed various theories to explain the role and origin of the giantess.

The meaning of the Old Norse name Bestla remains uncertain. Scholars have proposed potential meanings such as 'wife', or 'bark, bast'. It might stem from *Bastilōn (perhaps a yew goddess, originally a 'bast-donor'), or from *Banstillōn (via an intermediate form *Böstla), related to Old Frisian bös ('marriage, union', originally 'wife').

According to Rudolf Simek, "the name appears to be very old" due to its obscurity.

In Gylfaginning (The Beguiling of Gylfi), she is portrayed as the daughter of the giant Bölþorn and as the spouse of Borr, while the enthroned figure of Hárr (High) tells Gangleri (described as king Gylfi in disguise) of the genealogy of the god Odin.

He married that woman who was called Bestla, the daughter of the giant Bölthorn. They had three sons; the first was called Odin, the second Vili, the third Vé.

— Snorri Sturluson, Gylfaginning, 5–7, trans. J. Lindow, 2002.

In Skáldskaparmál (The Language of Poetry), a poem by the skald Einarr Helgarson refers to Odin as "Bestla's son".