Sure! I like dark fantasy quite a bit so forgive me if I write a lot
One of the classic dark fantasy series is
The Black Company by Glen Cook. It's about a mercenary company with a shadowy and ancient past, no saints themselves, who are hired in the first book by someone who turns out to be a lieutenant to the ruler of an evil empire. But they're honour-bound to maintain their contract...
Glen Cook also wrote a great fantasy standalone with a sort of Arabian feel to it called
The Tower of Fear. It's out of print but
well worth tracking down. I think it's one of his best books. The city of an evil wizard has been captured, but a resistance movement still plan a coup against their occupiers. Meanwhile the citadel, which is sealed and unbreachable, holds a few loyalists to the wizard who is not dead, but trapped in stasis. They send out agents to get the ingredients they need to rescue their lord: human sacrifices...
Another series I've been reading recently - but haven't finished 'cause I can't get book 3 - is by an author called K. J. Parker. The first book is
Shadow and the second
Pattern. It starts with a man waking up in a field of mud - a battlefield, littered with bodies. Everyone else is dead, and he realizes he can't remember who he is (he has amnesia). As he travels, people start recognizing him as someone dire, a monster of a man - and they're trying to kill him. This is definitely a low fantasy setting, with almost no magic at all, but it's a very compelling story.