Yasui Sentetsu (安井仙哲, 1734–1780) was a Japanese Go player, who is said to be born in either Aizu or Kawachi Province. His year of birth is unknown, but his birthname is believed to be Hara Gonhei(原權平). He served as an apprentice to Yasui Shuntetsu Senkaku.
In 1748, he changed his birthname to his present name, and began playing castle game oshirogo (御城碁). As he was part of a famous Go house, he would play with the other Go houses in the shogun's castle. In 1775, his mentor Yasui Shuntetsu Senkaku retired, causing him to become the sixth head of the Yasui house.
He died on September 4, 1780.
Mukai kaze ni tobitatsu ko no ha
Sukoshi houkou wo kaete arukou
Kimi ga te wo hiku
Nanigenai hibi ni mo
Shiawase wo nosete
Wasureteta omoi ga
Kaze no you ugokidashita
Kimi no koe de
Sunao ni warai aeru koto
Nante subarashii kimochi darou
Aruku hayasa ni ki wo tsukete
Awasete kureru yasashisa ni
Ai afureru
Kimi to onaji aozora
Ochiba fumishimete futo omou
Otona ni naru to tsuyoku naru bun dake
Moroku naru yo
Funsui no mae de
Kouun wo matsu yori
Boku to atatakai mono wo nomou yo
Sonna fuu ni
Nagareyou
Moshimo michi ni mayotta nara
Issho ni chikamichi mitsukeyou yo
Kangae sugi nakute ii yo
Kyou no sora ga taisetsu na hi ni naru to ii ne
Kimi to onaji aozora
Owari no nai
Koi ga aru kamo nante
Shinjite mo
Douka warawanai de...
Sunao ni warai aeru koto
Nante subarashii kimochi darou
Aruku hayasa ni ki wo tsukete
Awasete kureru yasashisa ni...
Moshimo michi ni mayotta nara
Issho ni chikamichi mitsukeyou yo
Kangae sugi nakute ii yo
Kyou no sora ga taisetsu na hi ni naru to ii ne