Ocean Monarch is the name of a number of ships.
Ocean Monarch (barque), a barque that caught fire in 1848 with the loss of nearly 180 lives
SS Ocean Monarch (1904), Russell and Co., Port Glasgow.
SS Ocean Monarch (1950), a Furness, Withy ship
SS Ocean Monarch (1956), a Shaw, Savill & Albion ship
Ocean Monarch (1955), The previous name of the Princess Daphne cruiseship