Sāijiàndùoluō 塞建陀羅 (Skt. Skandhila; also written 塞建地羅 Sāijiàndìluō; Chinese calque 悟人 Wùrén “one who has awakened”; DILA Authority A001424) was a Sarvāstivāda Abhidharma master credited with composing the Abhidharma-avatāra-śāstra 入阿毘達磨論 (KR6l0019, T1554), a concise introductory Abhidharma manual. He is described as an arhat (āluóhàn 阿羅漢) in the text’s attribution. A Tibetan translation of the same work survives in the Tengyur (D4100). His dates are unknown; he is placed tentatively in the post-Vasubandhu tradition, possibly 4th–6th century CE.