Bayside (Irish: Cois Bá) is a small residential suburb on the northside of Dublin, Ireland, purpose-built from 1967 on lands previously part of Kilbarrack. It has a planned central service area with retail facilities and lies inshore of Bull Island. It absorbed a neighbouring development, Sutton Park, also on Kilbarrack lands adjacent to Baldoyle. Established in 1967 under Dublin Corporation, it was later moved to the jurisdiction of Fingal County Council.

Bayside is located beside the sea, lying inshore of North Bull Island and Dublin Bay, and about 10 km north-east of the city centre. Built in the late 1960s and 1970s, it is situated between Kilbarrack Road in Kilbarrack, from which it was formed and Baldoyle, and lies near Sutton.

The area lies within the civil parish of Kilbarrack and is made up of the townlands of Kilbarrack Upper and Kilbarrack Lower.

Bayside falls within the postal district of Dublin 13.

Bayside was a planned development, built in the mid-20th century, on part of the lands of the large old district of Kilbarrack, whose largest settlement lay near what is now the centre of the new area. Title deeds for property in the area still show "Kilbarrack". Kilbarrack's historic church and graveyard, formerly the "Chapel of Mone", dating from the 13th century and once the mariners' church for Dublin, lie about two thirds of the way along Bayside's seafront towards Howth.

Built by Wates Group in the late 1960s and 1970s, Bayside comprises the housing developments of Sutton Park, Sarto, Alden, Verbena, Montini, Roncalli and associated roads including the Bayside Boulevards.^{[citation needed]}

In 2017, celebrations, organised by the Bayside Community Association, were held for the suburb's fiftieth year.

Established under Dublin Corporation in 1967, the area was later allocated to Fingal when County Dublin was split into three administrative areas.