Sure! I can think of a few off the top of my head, and I’m sure other people will have suggestions in the replies.
Rivers of London by Ben Aaronovitch is always my top pick! I’ve talked about them before, I think. PC Peter Grant is recruited to magic regulation branch of the Metropolitan Police—currently staffed by the last wizard in England, and literally no-one else— to solve a series of bizarre and gruesome murders. Hands-down my favourite aspect of these books is the goddess Mama Thames and her daughters (goddesses of the Thames’ tributaries) who control various territories in London.
Akata Witch by Nnedi Okorafor is a kid’s/teen book but it’s a phenomenal modern magic novel set in a village in Nigeria. Thirteen-year-old Sunny Nwazue finds out she is a Leopard Person— someone who has magic. She is thrown into the culture of Leopard People, where currency falls from the sky whenever you learn something new, everyone has their own unique spirit face, giant wasps build works of art out of detritus every morning and powerful spirits known as masquerades can be summoned if you are brave/foolish enough. Sunny and her friends must find teachers and master their juju quickly in order to take down the child-killer known as Black Hat. I’ve babbled about this book before, but it’s just so good.
While we’re on kids/teen books, there’s also the Skullduggery Pleasant series by Derek Landy. This is another magical-law-enforcement type deal except this time one is a Teen and the other is a skeleton. (Yeah). It’s funny, it’s dark, Valkyrie Cain is one of my favourite teen protagonists ever because she takes no shit and loves herself and spends a load of time getting buff so she can kick the crap out of bad guys. Subverts a lot of tropes and looks great doing it.
Neverwhere by Neil Gaiman is probably the most quoted example of the genre and you can see its fingerprints on a lot of urban fantasy novels written since. Richard Mayhew reaches out to a girl in trouble and ends up falling through the cracks of the city into London Below, a maze of mythic/political territories designated by Tube stations. Worth it for the Marquis de Carabas, if nothing else.
Plus, his Sandman graphic novel series. Not exactly urban fantasy, but definitely modern magic. Focussed around Morpheus, Lord of Dream and one of the seven Endless, who are all anthropomorphic personifications of various aspects of humanity. (Death is my favourite. Death is pretty much everyone’s favourite). The first few trades are self-contained vignettes, beginning with Morpheus’ search for some of his stolen equipment. Also, my babe Lucifer is in it, and he looks a bit like David Bowie.
oh and also? graphic novel-wise? check out DC’s Hellblazer, the comic series the film and upcoming Constantine series is based on. It is about a bisexual working class British magician and the absolute fucking shambles that is his life. This series can get pretty fucking dark, however, so definitely do your research beforehand. It’s easiest to start with the Original Sins trade paperback collection, but be warned that the Newcastle arc comes with a massive trigger warning for rape.
I’ve heard good things about The Dresden Files by Jim Butcher over the years, but those good things are usually accompanied by a self-deprecating eye-roll, so make of that what you will
Author-wise, you might want to check out China Mieville? I loved The City and The City but I wasn’t fond of Kraken (it had so much potential! urban gods! giant squid cults! a Familiars Union! augh!) so he’s a bit hit and miss for me. Perdido Street Station is one of his most popular novels, a kind of grimy almost-steampunk urban fantasy set in the fictional city of New Crobuzon, where there are women with scarab-beetles for heads, spliced human/animal/machine constructs, and demons. I have not read this book, but I am definitely going to at some point. King Rat is another London-based urban fantasy novel of his that you might want to check out.
Amazon is desperate to recommend me the Felix Castor novels by Mike Carey. It keeps sending me emails with SUPERNATURAL NOIR written at the top in an effort to lure me in and I am disgustingly predictable, because it’s working. If you read these before I do, let me know what they’re like?
SO. This turned out to be a lot longer than expected but I hope this was helpful! Please drop me an ask about books any time, I will talk about books forever.