Than Phu Ying Ploypailin Mahidol Jensen (Thai: ????????? ????? ??????; RTGS: Phloiphailin Mahidon Chensen; born February 13, 1981) is a member of the Thai Royal Family, a granddaughter of King Bhumibol Adulyadej of Thailand and a niece of King Vajiralongkorn of Thailand.
She is the eldest offspring of Princess Ubolratana Rajakanya of Thailand.
Ploypailin is not in the line of succession to the throne of Thailand as her mother relinquished her royal title when she married Ploypailin's American father, Peter Ladd Jensen.