Mar's Castle

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File:Mar's Castle, Gallowgate by George Gordon Burr - George Gordon Burr - ABDAG003295.jpg

Mar's Castle was a historic house in Aberdeen, Scotland, situated on the Gallowgate. It was similar in age and appearance to Provost Ross's House on the Shiprow.{{cite book|title=Aberdeen Before 1800: A New History|editor-last1=Dennison|editor-first1=E. Patricia|editor-last2=Ditchburn|editor-first2=David|editor-last3=Lynch|editor-first3=Michael|year=2002|location=East Linton|publisher=Tuckwell Press|isbn=1-86232-119-1|page=103|url=https://books.google.com/books?id=DFTP4dH28qsC&pg=PA103}} It is said to have been the townhouse of the Earls of Mar, and to have been built in 1594.{{Historic Environment Scotland|cat=PLA|num=20145|num2=NJ90NW 25|desc=Mar's Castle|access-date=27 June 2025}}

The castle was subdivided into shops and houses in the mid-19th century. By the end of the century, it had been deemed "no longer fit for human habitation" due to its "ruinous condition". It also created a bottleneck for traffic by projecting into the Gallowgate, and this induced the council to purchase and demolish the building in 1897. The loss was lamented by some Aberdonians, since the castle had been "the only picturesque structure in the whole length of that dismal and dreary thoroughfare".{{cite book|title=Aberdeen in Byegone Days|last=Anderson|first=Robert|year=1910|location=Aberdeen|publisher=the Daily Journal|page=35|url=https://archive.org/details/aberdeeninbyegonande/page/35}}