Is there a way I can shut off just the water going to the shower/bath?

So, my shower faucet is leaking pretty badly. By leaking, I mean it’s pouring out about half of the total water that it can. At this rate, it’ll take about 15 minutes to fill up the bathtub. And it’s all hot water, because cold isn’t an option from that faucet. I’ve already sent an email to my landlord, but I feel like I should turn off the water if I can. But, I only know how to shut off the water to the toilet, and the main water valve (but that would mean the other people who live in this house couldn’t do things like flush the toilet or wash their hands, so I’d rather not do that unless there’s risk of actual damage).

So, help? Thoughts?