Let me begin by saying 
I own a TON of cookbooks.  Like more than any reasonable human being will ever need.  However, I justify this because it's the only thing I collect AND I read them like they are novels.  Because of this, I own vegan and non-vegan cookbooks.  I love food writing by 
Melissa Clark (her red lentil soup with lemon recipe is my all-time favorite!), 
Claudia Roden, 
Molly Wizenberg and 
Dorie Greenspan.  For obvious reasons, I only cook very infrequently from these books since very few recipes are vegan-friendly.  Mostly, these books sit very pristinely on the shelf.
I do, however, cook like a mad woman from all of my vegan cookbooks.  The pages are stained and wrinkled from lots of cooking love.  I wanted to share with you some of the ones I use the most, but I should be clear: this was like choosing my favorite children. Here are five of my favorites:
1. 
Appetite for Reduction by Isa Chandra Moskowitz : I love all of Isa's books, but this one is really stellar and right now it's probably my favorite out of all the cookbooks I own.  It is so overused in my kitchen (and by that, I mean dirty and crumpled!), that I would feel awful even asking Isa to sign it if I ever met her.  I've tried many, many recipes from here and each one has become a regular part of our menu rotation:  Try these: Chimichurri tofu, buffalo tempeh, butternut rice, pineapple collards, vegetable korma.
2. 
The Joy of Vegan Baking by Colleen Patrick-Goudreau : This was one of the first vegan cookbooks I owned.  The lemon bars are what really convinced me that you don't need butter, eggs or milk to have amazing desserts.  Colleen's work is crucial and I appreciate her attitude toward veganism so much.  Also check out her other cookbooks, which are gems as well.
3. 
Vegan on the Cheap by Robin Robertson : Robin is probably the single most prolific vegan cookbook writer (and, ahem, I own most of them!).  I've never had a recipe of hers that wasn't great.  This book in particular has some wonderful recipes.  Try: spanokopita (life changing!), samosa pie, and tropic of tempeh.  I also like this one because this is Jesse's cookbook, meaning about once a week he makes us something from here.  It's a win-win for me!
4. 
Vegan Yum Yum by Lauren Ulm : This is how every single cookbook should look: great instructions and beautiful color photographs for all of the recipes.  One of my favorite meals is the chili lime tofu with collards and quinoa.  I use the dry-frying method she details in that recipe at least once a week.  I still mourn the fact that she doesn't update 
her blog anymore!  I still use it for culinary inspiration.  Come back, Lauren, come back!
5. 
How to Cook Everything Vegetarian by Mark Bittman : I know, I know--this one isn't entirely vegan and I also know some people have strong opinions about Bittman.  However, this is a great reference book.  There have been times in my life that I've purchased produce or a spice that I didn't know what to do with and this book saved the day.  
His app is also great for when we're traveling and need a veg recipe on the go.
What are some of your most beloved cookbooks?