Fitzwilton House was a brutalist concrete and steel office block in Dublin, Ireland completed in 1969 and demolished in October 2018.

[6] The building included a number of commissioned works by notable Irish and British artists including Robert Ballagh, Barrie Cooke, Anne Madden and Michael Farrell, some of which have since been transferred to the Trinity College Dublin Art Collection.

[8][9] The structure replaced 6 classical style houses which faced on to the Grand Canal and Wilton Terrace and sat adjacent to the grounds of Fitzwilliam Lawn Tennis Club while overlooking the triangular Wilton Square park.

The office was constructed for Fitzwilton Securities, a company mainly owned by Tony O'Reilly via its takeover of W. & H. M.

[12] A new office developed by IPUT real estate and designed by Henry J Lyons named One Wilton Park replaced Fitzwilton House in 2022.