Abbeyside (Irish: Dún na Mainistreach, meaning 'fort of the monastery') is a townland in Dungarvan in County Waterford, Ireland.

MacGrath's Castle was a notable landmark in Abbeyside, overlooking Dungarvan Harbour, until it collapsed in January 1916.

It was a six-storey tower house, reputedly built by the MacGrath family, and labelled MacCragh's Castle in the Civil Survey of 1654.

The club plays both hurling and gaelic football and competes in both senior codes in the county.

[citation needed] Stage 2 of the 1998 Tour de France passed through Abbeyside.