Sean Patrick Astin (seⁿ-miâ Sean Patrick Duke; 1971 nî 2 goe̍h 25 chhut-sì) sī Bí-kok ê ián-oân, siaⁿ-im ián-oân, kàn-tok kiam chè-chok. I siāng chai-miâ ê ián-chhut chi it sī tī 2001 nî kàu 2003 nî kan The Lord of the Rings tiān-iáⁿ lāi poaⁿ Samwise Gamgee.