Not that many autobiographies, for obvious reasons. While other arts are turned inwards, photography is, with a few exceptions, entirely turned outwards. This means that for the photographers the work is the autobiography—what they saw, who they saw, what they felt. What's left, when turned into words, often becomes mostly anecdotal, which is the case, for example, with the Ansel Adams autobiography (sarcastic minds will state that most of his photography is also anecdotal, but that's for another thread

).
That said, there are some worth reading. Top on my list is Gordon Parks'
A Choice of Weapons, one of the most powerful autobiography you'll ever read. Ends early in his life—he followed that with
To Smile in Autumn—but it's entirely worth it. I have Don McCullin's
Unreasonable Behaviour on my bookshelf. People have told me good things about it, but, again, I haven't had time to read it yet.
Danny Lyon is an immensely interesting photographer that isn't mentioned enough. His essays are somewhat in between being about biography and about photography. They are collected in
American Blood: Selected Essays.
Biographies of photographers aren't that common either. On Cartier-Bresson, Pierre Assouline's
Cartier-Bresson: L'oeil du siècle and, not exactly biographical,
Henri Cartier-Bresson: Interviews and Conversations 1951-1998, published by Aperture. Both are worth reading, but also quite frustrating, for different reasons, if you want to actually learn something about him. The already mentioned
American Witness: The Life and Art of Robert Frank is good. A couple of biographies that are waiting on my bookshelf for me to have time reading them—can't wait for retirement—are Paul Delany's
Bill Brandt: A life, James R. Mellow's
Walker Evans, Arthur Lubow's
Diane Arbus: Portrait of a photographer, Milton Metzer's
Dorothea Lange: A Photographer's Life and Linda Gordon's
Dorothea Lange: A Life Beyond Limits. Also on my list, but further back:
George Rodger: An Adventure in Photography. I don't have
W. Eugene Smith: Shadow and Substance, The Life and Work of an American Photographer. It's on my to buy list, but haven't had anyone recommend it (any body here read it?).
David Goldblatt's
The Last Interview is excellent, but not exactly in biographical or autobiographical format.
For a mix of biography and photographs in the same book, a couple of notable ones that I went through recently:
Sam Stephenson's The Jazz Loft Project: Photographs and Tapes of W. Eugene Smith from 821 Sixth Avenue 1957-1965, and
The Life and Works of Sid Grossman by Keith F. Davis. Regarding Gene Smith, best biographical work remains the documentary
The Jazz Loft According to W. Eugene Smith, just as
All Things are Photographable is the best biographical work about Garry Winogrand.
I still think photographers most eloquent when writing on photography — "on looking" would be a better way to state it. Books by Stephen Shore, Robert Adams and Tod Papageorge to me are essential reading for anyone interested in photography.
Two photographers who mix well writing and photography in the same book, in a somewhat autobiographical manner—in the sense "this is what
I saw"—, albeit in very different ways, are Teju Cole and Raymond Depardon. Depardon is interesting in that he harks back to a 19th-century style of travel writing, without the colonial undertones, of course.
As far as non-photographers writing about photographers and photography in a non-theoretical manner, Geoff Dyer's
The Ongoing Moment is a fantastic read.
Some photographers about whom I wish there was either biography or autobiography in English or in French: Josef Koudelka, Ernest Cole and Josef Sudek.