A tugboat, or tug, is a motor ship used to manoeuvre, primarily by towing, other vessels in harbours, over the open sea or through rivers and canals. They are also used to tow barges, disabled ships, or other equipment. Formerly sometimes in categorising "towboat" was used, but Webster's new twentieth century dictionary describes "tug" with "to tow with a tugboat".

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  Hochseeschlepper
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  Hochseeschlepper Juist
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  Schlepper Wustrow
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  Schlepper Wustrow / bow
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  Schlepper Wustrow / stern
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  Schlepper Dranske
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  Schlepper Dranske
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  Schlepper Fairplay 26
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  Polish tugboat Ajaks
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  The French tugboat Abeille Flandre in Toulon's harbor (France).
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  The French tugboat Guerande in St Nazaire's harbor (France).
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  Tugboat in Port Gdynia
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  Tugboat operating on the Mississippi River
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  Bugsier 18, Hamburg, Germany
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  ASL Prosper III, Samarinda, Indonesia.
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  Tugboat V. B. Sargazos, Port of the Bay of Cadiz, Spain
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  Tugboat pulling a barge in a strait in Helsinki
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  Tugboat Agia Varvara at Krakari Jetty, Piraeus, Greece
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  Tugboat Atreus, A-439, of the Hellenic Navy
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  Tugboat Alexander 3, Piraeus, Greece
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  Tugboat Armadores I, Piraeus, Greece
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General Types of Modern Merchant Ship
	Dry Cargo Ships • Bulk carrier • Container ship • Reefer ship • RORO Ship • Tankers • Chemical tankers • Coastal trading vessel • Passenger ship • Cruise ship • Ferry • Cable layer • Tugboat •  Dredger •  Category:Barges •  Panamax • Capesize • Seawaymax • Handymax • Handysize • Aframax • Suezmax • Malaccamax • VLCC • ULCC