Knockfin (from Irish Cnoc Fionn, meaning- The White Hill) is a townland in the civil parish of Drumreilly, barony of Tullyhaw, County Cavan, Ireland.
Its chief geographical features are Sliabh an Iarainn mountain on whose eastern slope it lies, mountain streams, waterfalls, a lime-kiln and dug wells.
It is traversed by minor public roads and rural lanes.
The Tithe Applotment Books for 1834 spells the name as Kockfin and list three tithepayers in the townland.
[2] The 1836 Ordnance survey Namebooks state- The soil is light yellow clay intermixed with sand & limestone, neither of which is quarried or used in any way.