Thady Connellan (Irish: Tadhg Ó Coinnialláinn) (1780–1854) was an Irish school-teacher, poet and historian.

He was born in Skreen, County Sligo, and was a relative of the scholar Owen Connellan.

Albert Blest[1] (father of William Cunningham Blest), a Baptist, supported by the London Hibernian Society in Greenville, Coolaney, in the early 1800s.

Like his relative Owen he left the Catholic church and embraced Protestantism, around 1808.

[2] Among other works he produced an Irish-English dictionary and edited a series of song-books.