Carrigallen (Irish: Carraig Álainn) is a barony in County Leitrim, Ireland.

The MacRannall chiefs held much of this barony as part of the territory called Conmaicne Mag Rein.

[3] There are a number of medieval artifacts from Carrigallen barony preserved in a collection at the Royal Irish Academy museum in Dublin.

A small medieval brooch-pin with highly decorated penannular rings was found on the bed of the Yellow river near the Ballyduff Bridge near Ballinamore, Oughteragh parish in county Leitrim,[4] and a bronze medieval sword blade was found in the crevice of a rock on the same river, the blade being perfect, with a broad leaf pattern, bevel edge, handle-piece welded, six rivet-holes on the handle (two not through), with hilt notches, measures 0.46 metres (1 ft 6.1 in) long by 3.2 centimetres (1.3 in) width.

[5][6] A Celt was found in the bed of the river at Ballyheedy bridge, at Ardrum downland near Ballinamore in county Leitrim, a good long narrow specimen, of bright yellow bronze, triangular shaped, flat-surfaced, and roughly decorated with a hammered fan-tailed ornament radiating towards the blade.