Will my luggage be transferred during a transit at Sharjah?

I am traveling from London to Lahore via Sharjah air port with a single return ticket. Will my luggage will be delivered to Lahore or will I have to shift it at Sharjah airport?

Difficult to say. Given the strange routing I assume this to be an Air Arabia ticket. The tricky part here is that Air Arabia identifies as "primarily a point to point carrier", whatever the heck that is supposed to mean.

The language around this in their T&C is vague and confusing. See https://www.airarabia.com/en/about-us/conditions-of-carriage . It is unclear whether they transfer luggage. It's also not clear (to me) whether you need a to enter the UAE (and need proper documentation to do so). Again, the language is confusing (https://www.sharjahairport.ae/en/connecting-flights/)

Practical advice: Pick up the phone, call them and ask. If any possible, get a written confirmation of whether you need UAE entry credentials or not. Picking up and re-checking baggage is a minor nuisance, being denied boarding because you are lacking a required UAE visa is bad.