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Odfjell
Odfjell SE is a Norwegian shipping and tank-terminal company headquartered in Bergen, founded in 1914 and operating a deep-sea chemical tanker fleet of 77 vessels.
Off-hire
Off-hire is the suspension of hire payments under a time charterparty when a vessel cannot perform the service the charterer is paying for, protecting the charterer.
Ohio-class submarine
The Ohio class is a class of 18 nuclear-powered ballistic-missile submarines built for the United States Navy by General Dynamics Electric Boat; 14 carry Trident II D5 missiles and four became guided-missile submarines.
Oil tanker
The oil tanker, or petroleum tanker, is a merchant ship that carries products in bulk and, as of 2023, comprised nearly 36.9% of the entire global fleet.
Oliver Hazard Perry-class frigate
The Oliver Hazard Perry class is a class of guided-missile frigates built for the United States Navy from 1977, totaling 51 American ships plus 20 for foreign navies.
Olivier Levasseur
Olivier Levasseur, known as La Buse, was a French pirate of the Golden Age of Piracy, remembered for capturing the Portuguese treasure ship Nossa Senhora do Cabo in 1721.
Olympic-class ocean liner
Olympic class (Olympic, Titanic, Britannic) was a trio of British transatlantic passenger liners built by Harland & Wolff for the White Star Line between 1908 and 1915.
Oneonta (steamboat)
Oneonta was a side-wheel steamboat built in 1863 for the Oregon Steam Navigation Company, running the middle Columbia River between the Cascades and Celilo Falls.
Optimist (dinghy)
Optimist dinghy: small single-handed sprit-rigged pram for children, designed 1947 by Clark Mills in Clearwater, Florida; IODA one-design class sailed in over 120 countries, over 150,000 registered boats, 35 sq ft sail, 35 kg hull.
Ordinary seaman
An ordinary seaman is the entry-level, unlicensed deck rating on a merchant ship, ranking below able seaman, performing maintenance, cleaning, and helm and lookout watches under supervision.
Orient Express Corinthian
Orient Express Corinthian is a 220-meter luxury sailing yacht built for Accor's Orient Express brand, described as the world's largest sailing yacht, launched in 2026.
Orient Overseas Container Line
Orient Overseas Container Line (OOCL; Chinese: 东方海外货柜航运公司) is a Hong Kong container shipping company founded by C Y Tung and owned since 2018 by COSCO SHIPPING Holdings.
Oscar-class submarine
The Oscar-class submarine is a Soviet and Russian nuclear-powered cruise missile submarine class, known in Russia as Project 949 Granit and built to attack aircraft carrier groups.
Oseberg Ship burial
The Oseberg ship burial is a Viking Age grave mound near Tønsberg, Norway, where a decorated oak ship built around 820 served as the burial place of two women in 834.
Ourang Medan
The Ourang Medan is a legendary ghost ship, supposedly a Dutch freighter found adrift with its whole crew dead and its holds on fire around 1939.
Outboard motor
The outboard motor, also called an outboard engine, is a self-contained boat propulsion unit bolted to the transom, combining engine, gearbox, and propeller in one tiltable unit.
Outfitting
Outfitting is the phase of ship construction in which a vessel's piping, electrical wiring, joiner work, machinery, and painting are installed beyond the steel hull structure.
Outrigger canoe
An outrigger canoe is a paddling and sailing boat stabilized by floats fastened to its hull, developed around 5,000 years ago and used to settle the Pacific Islands.
Ovation of the Seas
Ovation of the Seas is a Quantum-class cruise ship of Royal Caribbean International, built by Meyer Werft in Germany and delivered in 2016 as the class's third ship.
Owen Chase
Owen Chase (1798–1869) was an American whaling captain, first mate of the whaleship Essex when a sperm whale sank it in 1820, and author of its wreck narrative.
P&O Cruises
P&O Cruises is a British cruise line based in Southampton, England, operated by Carnival UK and descended from the 1837 mail service that made it the oldest cruise line.
P&O Ferries
P&O Ferries is a British ferry operator owned by Dubai-based DP World, running Dover–Calais, Hull–Rotterdam, and Irish Sea routes and carrying over 10 million passengers a year.
Pacific Basin Shipping
Pacific Basin Shipping (太平洋航运集团有限公司) is a Hong Kong-founded owner and operator of Handysize and Supramax dry bulk vessels, listed on the Hong Kong Stock Exchange under stock code 2343.
Pacific International Lines
Pacific International Lines (PIL) is a Singapore container shipping line founded in 1967, among the top 12 carriers worldwide and the largest in Southeast Asia.
Packet boat
A packet boat is a vessel on a regular coastal, river, or canal route carrying passengers, freight, and mail, named for the mail packets it carried.
Packet trade
The packet trade was the carriage of mail, passengers, and cargo by vessels on fixed schedules, beginning with the Black Ball Line between New York and Liverpool in 1818.
Paddle steamer
A paddle steamer, also called a paddlewheeler, is a steam-powered watercraft driven by side paddle wheels or a single stern wheel; it dominated river and coastal steam navigation until the screw propeller displaced it at sea.
Pallet
A pallet, also called a shipping or cargo pallet, is a flat platform for stacking and moving goods as one load, typically lifted by forklifts.
Pamir (ship)
Pamir was a German four-masted steel barque built in 1905 for the Laeisz line's Flying P-Liners, and sank in 1957 in Hurricane Carrie, killing 80 of the 86 aboard.
Panama Ports Company
Panama Ports Company, a subsidiary of Hong Kong's CK Hutchison Holdings, operated the ports of Balboa and Cristóbal at the Panama Canal from 1997 until 2026.