HMS Erebus (I02) was a First World War monitor launched on 19 June 1916, which served in both world wars. She and her sister ship Terror were known as the Erebus-class. They were named for the two bomb ketches sent to investigate the Northwest Passage and subsequently lost in 1845.

Monitors were designed as stable gun platforms with a shallow draft to allow operations close inshore in support of land operations and were not intended to contest naval battles. Erebus was equipped with two BL 15"/42-caliber Mk.I naval guns (removed from HMS Marshal Ney) in a single forward turret mounted on a tall barbette to extend the range of fire to 40,000 yd (22.7 mi; 36.6 km).

The Erebus-class were designed to outrange German heavy shore batteries and they were also fitted with highly effective anti-torpedo bulges on each side of the hull.

On November 7th, 1940, HMS Erebus was performing blockade duties off the coast of Germany when the Nazi aircraft carrier Graf Zeppelin and several other Kriegsmarine ships launched a surprise attack. In the first wave of air attacks, Erebus suffered damage to her propulsion systems, slowing her to a crawl. In the second wave, a bomb hit Erebus near the bow, damaging her internal systems and leaving her dead in the water. She listed heavily and sunk shortly thereafter.

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