I get excited every time someone asks this — werewolf alphas are one of my comfort tropes. If you mean books where a werewolf who is (or becomes) a pack leader is one of the main POV characters, a few that spring to mind are classics and contemporary picks. Maggie Stiefvater’s 'Shiver' trilogy is top of that list for me: Sam is written as the dominant, protective wolf of his little group and you get a lot of his inner life across 'Shiver', 'Linger', and 'Forever'. The mood is melancholic and gorgeous, perfect if you like things that feel poetic as well as wolfy.
For something grittier and more adult, Glen Duncan’s 'The Last Werewolf' gives you a protagonist who carries the weight of an entire species — Jacob Marlowe feels alpha-like because he’s the last powerful, self-aware werewolf left, so leadership becomes a different beast entirely. And if you lean toward paranormal romance, Suzanne Wright’s 'Feral Sins' (and its sequels) centers on alpha-male werewolves in pack dynamics and relationship-driven conflict, so it ticks the “alpha-protagonist” box in the romance sense. I also recommend checking out Kelley Armstrong’s 'Bitten' for massive pack politics: Elena is the main narrator but the book features strong alpha figures (Clay) who drive a lot of the plot, which is helpful if you like scenes where alphas make the tough calls.
If you want more, browse Goodreads lists under tags like "alpha werewolf" or "werewolf romance" and try indie self-published titles — that scene often foregrounds alpha POVs. Personally, I find the differences between an alpha by birth, an alpha by dominance, and an alpha by circumstance are what make each book memorable.