HMS Marshal Ney was the lead ship of her class of two monitors built for the Royal Navy during the First World War.

Designed for inshore operations along the sandbank-strewn Belgian coastline, Marshal Ney was equipped with two massive 15-inch (380 mm) naval guns in a single turret.

The diesel engines used by the Marshal Ney-class ships were a constant source of technical difficulty, hampering their use.

Marshal Ney in particular was—in the words of Jane's Fighting Ships—"practically a failure", on account of her MAN diesel engines being so unreliable.

Renamed Vivid in July 1922, she then served as an accommodation ship for the stoker training section at Devonport, where she remained until 1957.