Seltannasaggart (from Irish Sailtean na Sagart, meaning 'willow plantation of the priests'), also called Corry Mountain, is a low mountain near Lough Allen on the border of County Roscommon and County Leitrim in Ireland; it is the highest point in Roscommon.

The mountain is the highest point of County Roscommon. It is part of the Arigna Mountains and rises to a height of 428 metres (1,404 ft). On the southern slopes are the remains of a promontory fort and sweat houses.

There is a wind farm and a quarry on the summit, which is easily accessible. The Miners Way trail passes over it.

• Lists of mountains in Ireland
• List of Irish counties by highest point
• List of mountains of the British Isles by height