The Morell River is a tributary of the River Liffey system in County Kildare, Ireland, flowing through the lower Liffey catchment as part of the Morell River sub-catchment. This modest but productive river winds through the agricultural lowlands of Kildare, offering intimate wild brown trout fishing in a pastoral Irish setting. Electrofishing surveys have confirmed healthy populations of brown trout throughout the river's length, with fish recorded at multiple survey sites from Morell Bridge downstream through Sherlockstown Common, Killeenmore, and Old Morell Bridge. The river's character is typical of a lowland Kildare tributary — relatively shallow and clear, with a mix of gravelly runs, riffles, and slower pools that provide varied habitat for both juvenile and adult trout.