Viscount of Arbuthnott is a title in the Peerage of Scotland. It was created in 1641, along with the subsidiary title Lord Inverbervie, for Sir Robert Arbuthnott. The Viscount of Arbuthnott is the hereditary chief of Clan Arbuthnott.

At the time of the 16th Viscount's death in 2012, the family held the genealogical record of being one of an unbroken male line living in the same spot for more than 800 years. Around 1188, William the Lion granted ancestor Hugh de Swinton the lands of Arbuthnott, where the family estate and clan association headquarters remain to this day.

All Scottish viscounts have 'of' in their titles, contrary to English viscounts who are styled simply 'Viscount X'. However, most Scottish viscounts have now adopted the English practice; only the Viscount of Arbuthnott and, to a lesser extent, the Viscount of Oxfuird, continue to use 'of'.

The family seat is Arbuthnott House, Arbuthnott, near Inverbervie in Kincardineshire, although the current Viscount and his wife do not live there. Rather, the heir apparent and his family live within the Arbuthnott House.

The heir apparent is the present holder's only son, the Hon. Christopher Keith Arbuthnott, Master of Arbuthnott (b. 1977).
The heir apparent's heir apparent is his only son, Alexander Nicholas Keith Arbuthnott (b. 2007).