James Henry Sproul Cousins (1873-1956) was an Irish writer who was a playwright, critic and poet; ultimately he was known as a writer on theosophy. He used a pseudonym Mac Oisín and the Hindu name Jayaram. He was born in Belfast.

His plays were produced in the first years of the twentieth century by the Irish National Theatre ; he also acted. He then taught and worked as an editor. He travelled in 1915 to India, converting to Hinduism. He later worked for the Irish Literary Theatre.

He wrote a joint autobiography with his wife Margaret.

Reference

• James Henry Cousins (1994) by Dilip Kumar Chatterjee.