The Decatur-class was a series of Federation cruiser starships in Starfleet service around the time of the late 23rd century. The basic design and specifications of the Decatur vessels is quite similar to that of the Enterprise-subclass refit Constitution-class heavy cruisers, with a different warp nacelle configuration and modified warp drive engineering accommodations. (ST comic: "Who's Who in Star Trek")

A training vessel (see unnamed Federation starships) for Starfleet Academy in the 2350s was a Decatur-class ship, for cadet test scenarios proctored by Commander Silas. (TNG comic: "Thin Ice")

This ship appeared only as a drawing in two comic books, although the design was lifted from the unlicensed Ships of the Star Fleet and other publications, which provide much more detailed specifications than the approximations noted here, which are based on the vessels' use of Constitution-class components, which have known measurements in licensed publications.

Starship classes of the United Federation of Planets
By name	Aakenn • Achernar • Achilles • Advance • Aegian • Aeolus • Aerie • Akira • Akula (destroyer) • Akula (frigate) • Alaska • Ambassador • Andes • Andromeda • Andor • Antares • Anton • Apache • Apollo • Archer • Ariel • Ascendant • Avenger • Babcock • Bader • Baker • Baton Rouge • Bode • Bolarus • Bonaventure • Bonhomme Richard • Bradbury • Brenton • Canada • Canopus • Capella • Centaur • Centaurus • Cerberus • Challenger (deep space explorer) • Challenger • Chandley • Charger • Chariot • Chesapeake • Cheyenne • Chimera • Christopher • Cle Dan • Cochise • Cochrane • Constellation • Constitution • Continent • Copernicus • Cygnus • Daedalus • Danube • Decatur • Decker • Defender • Defiant • Deneva • Derf • Dollond • Doppler • Dreadnought • Drexler • Durrett • Eagle • Edward • El Dorado • Enterprise (23rd century) • Enterprise (alternate future) • Epoch • Epsilon • Erewon • Excalibur • Excelsior • Federation • Fenlon • Fermi • Fiji • Freedom • Frontier • Gagarin • Galaxy • Galen • Geneva • Genser • Graceful • Grayson • Griffon • Hale • Hardin • Hephaestus • Hermes (scout) • Hermes (fast cruiser) • Heston • Hogan • Hokule'a • Horizon • Huron • Icarus • Incursion • Indomitable • Intrepid • Iowa • Istanbul • Iwo Jima • Class J • Karekh • Keith • Keppler • Kethkin • Kiev • K'Kmarak • Kolm-An • Korolev • Larson • Lauro • Laweya • Legacy • Lenthal • Lexington • Liberty • Loki • Loknar • London (troop transport) • Luna • Makin • Mann • Marklin • Marshall • M'Benga • Mediterranean • Merced • Mercury • Merian • Messier • Midway • Miranda • Mission • Missouri • Mockingbird • MoKal • Monoceros • Moscow • Mulciber • Nebula • Nelson • New Orleans • Newport • Niagara • Noble • Nomad • Northampton • Norway • Nova • Oberon • Oberth • Odin • Odysseus • Odyssey • Okinawa • Olympic • Oppenheimer • Orion • Osaka • Overfield • Paladin (destroyer) • Paladin (24th century) • Philadelphia • Phoenix • Pinnacle • Piper • Polarity • Pollux • Portsmith • Premonition • Prometheus • Proxima • Ptolemy • Pyrenees • Rakota • Ranger (cruiser) • Ranger (scout) • Reliant • Remora • Renaissance • Rickenbacker • Rigel • Rochester • Royal Sovereign • Saber • Sagan • Saladin • Samson • Santa Fe • Sawyer • Scorpio • Scylla • Sequoia • Shi'Kahr • Sierra • Siva • Solar • Sovereign • Soyuz • Springfield • Steamrunner • Surak • Sydney • Venture • Tangent • Theophrastus • Thomas Paine • Thucydides • Thufir • Ticonderoga • Tikopai • Tritium • Typhon • Ukora • Ulysses • Ural • Utah • Vesta • Vigilant (scout) • Vigilant (tactical escort) • Voyager • Wambundu • Wilkerson • Wei-Fa • Wellington • Wells • Yamato • Yorkshire • Zodiac • unnamed
By type	Federation cargo ship • Federation colony ship • Federation construction ship • Federation galaxy ship • Federation light cruiser (Intrepid-variant) • Federation mining freighter • Federation repair ship