Þórsdrápa (also Thorsdrapa; Old Norse: 'The Lay of Thor') is a skaldic poem by Eilífr Goðrúnarson, a poet in the service of Jarl Hákon Sigurðarson.
With the aid of some magical gifts from the giantess Grid (Gríðr), Thor, accompanied by Þjálfi, defeats Geirrod and kills a number of other giants.
The narrative then details Thor's (highly metaphorical) crossing of the oceans to Jötunheimr, with Þjálfi hanging onto his waist band.
Being a drapa (drápa) the poem is rich in praise of Thor and Þjálfi's valour in making the difficult crossing.
The myth related in the poem is also preserved in prose form by Snorri Sturluson in the Skáldskaparmál and a looser analogue is found in Saxo Grammaticus' Gesta Danorum.