Newgate Prison (Irish: Príosún an Gheata Nua) was a place of detention in Dublin, Ireland.

It was 180 feet (55 m) south of another gate, Brown's Castle, which would also become a place of detention known as the Black Dog while the nearby Tholsel was also used as a jail and debtors prison at various times.

While there are no reports of successful escapes via this route, it was raised by Inspectors as an obvious design deficiency.

[2] By the 1840s it was used solely for the holding of remand prisoners, both male and female, usually for a period between a few days and three weeks.

When visited by one of the Prison Inspectors in 1843 there were "30 Males, 9 Females and 11 Lunatics" confined there, but this was considerably less than the average of 100 usually kept there.