The Big Three:

Lee Jeans (Check out their 101 Collection)
Levi Strauss & Co. (Check out their Vintage Collection)
Wrangler (Check out their Made in the USA Collection)
A-F:
Acne Studios
​Adelaide Denim
AG Jeans
Agave
​Agreste
Aiiro Denim Works
​Amory Jeans
AmsterDenim
A.P.C. ​
Arbeit Denim
Artisans of Refined Workwear
​Atelier La Durance
Benson Bluelegs
Benzak Denim Developers
Big John
Black & Denim
​Black Horse Lane
​Blaumann Jeanshosen
Blue Blanket Jeans
Blue Mosey Company
​Blue Muscle Union
Blue States Denim
​Bluer Denim
Brave Star Selvage
​Brund
Buck Mason​
​Carbonsix
Carnivores Soul
​Charles Miller Brand
Cheap Monday
Cheese Denim
​Chet Denim
Ciano Farmer Denim
​Civilianaire Clothing
​C.O.F. Studio
Companion Denim
Crawford Denim & Vintage Co.
Dark
Dawson Denim
Dearborn Denim
DENHAM the Jeanmaker
​Denime
​Denim Error
DenimKratos
​Detroit Denim Co.
​Diesel
DSTLD
​Dyke Denim & Co. ​
Earnest Sewn
​Eastman Leather Clothing
Eat Dust
​E.C. Workwear ​
Edge Denim
Edwin
​El Charro
Endrime
​Esre Denim
Eternal
Evgeniy Fedorov
​Atelier
Evisu
Fitted Underground
​Flat Head
​Flip Jeans Co.
Flying Machine
Freenote Cloth
Fullcount & Co.
G-O:
G-Star RAW
Genetic Denim
Gilded Age
Glad Hand & Co.
​Grease Point Workwear
Grivec Bros.
Gustin
​HandCrop Cotton
Hellequino
Hiut Denim
Hive Foundary Denim
Horn Jeans
Imogene + Willie
​Indigofera Prima Jeans
Indigo Skin Jeans
​Ironclad Denim & Co.
Iron Heart
Jack & Jones
Jacob Cohen Jeans
Japan Blue
J Brand
JeansDa Co.
John Bull
John Elliott
​Journal Projects
Kapital
​KATO Brand
​Kerbside & Co.
Killer Jeans
​​Kings of Indigo
​Kojima Genes
Kostera
Kuyichi
​L.C. King ​
Left Field
Level 7 Jeans
Livid Jeans
Loren & BLKSMTH Denim
​Make Your Own Jeans
Marc Nelson Denim
Martini Denim USA
Mavi
Milestone Basement
​Mischief Denim
Mister Freedom
Momotaro
Mugsy Jeans
Naked & Famous
​Neuw Denim
Nine Lives
​Noble Denim
​No Branded On
Nudie Jeans
Numero Uno
Oldblue Co.
Ole Denim
Olifant Denim
​One Piece of Rock
Oni Denim
​OrSlow
Outland Denim
P-Z:
Pepe Jeans
​Pedestrian Jeans
​Phi Denim
PRPS
Pure Blue Japan
Rag & Bone
Railcar Fine Goods
Raleigh Denim Workshop
Rally Raider Jeans
​Red Cloud
Replay Jeans
​Rest Denim
Rising Sun Jeans
​Rite Stuff
Rogue Territory
Roy Denim
​Sage
Samurai
Shockoe Atelier
​Soorty Enterprises
SOSO
SOURCE Denim
Spykar
​Stevenson Overall Co.
Studio D'Artisan
Sugar Cane Denim
​Tanuki Inc.
Tellason
Tenden
​The Jean Shop
​Three Kingdoms Overalls
Tilden
Tod Shelton
​True Religion
​Twerd
​Two Women Two Men
Unbranded
ULLAC
​Union of Friends Denim
Uniqlo
​Viapiana
Warehouse & Co.
​Wingman Denim
Worker Shield & Co.
#:
3sixteen
​34 Heritage
3X1 Denim
45R
​7 for All Mankind

Learn About Denim

Below are two great videos if you are new to the denim world.  The first one is by Carl Murawski, a great style vlogger, and the second one is by the Editor of Rope Dye, Matt Wilson, who's website is also an awesome resource for denimheads!

The third video is a trailer for the documentary Blue Gold, which you should check out if you love denim!