Samuel Oton Sidin OFM Cap (born 12 December 1954) is the Indonesian Roman Catholic bishop of Diocese of Sintang, being appointed in 2017.

Sidin was born in Pontianak, Indonesia,[1] and attended seminary Nyarumkop and entered the order of Capuchin friars in 1977.

He completed his philosophical and theological studies at the inter-diocesan seminary in Pematangsiantar in Medan.

Sidin held multiple positions as a Capuchin priest, being the parochial vicar in Nyarumkop from 1984–1985, being the provincial minister of Pontianak from 1997 to 2003, and from 2003 to 2008 had been in charge of missionary efforts among the Dayak people of Borneo.

[2] After being ordained in 2017 at the age of 62 Sidin was installed as bishop of Sintang succeeding Agustinus Agus who had been appointed archbishop three years earlier.