If you mean an on-chain wallet address created completely offline, yes you can. There's several ways, but to start you could look at guides about how to properly use bitaddress.org, or even better would be to generate an address offline through a hardware wallet. I generally like the seedsigner for that, it's quite a brilliant project but you need a bit of custody expertise and bitcoin fundamentals.
If you mean an on-chain wallet address created completely offline, yes you can. There's several ways, but to start you could look at guides about how to properly use bitaddress.org, or even better would be to generate an address offline through a hardware wallet. I generally like the seedsigner for that, it's quite a brilliant project but you need a bit of custody expertise and bitcoin fundamentals.