New from Dell, no -- you'd need to locate a model that shipped with Windows 10 through a reseller. You can install Windows 10 yourself after you receive the system, but bear in mind that means no support for the installation from Dell (and you will be required to reinstall Windows 11 before any support is rendered in the future, so making and testing a complete system image or setting aside the original SSD in favor of a replacement to use with Windows 10 would be a very good idea).  
Can I buy Alienware Gaming Laptop as windows 10 instead of windows 11? I scrolled through a lot of the Alienware Laptops, and it appears all of them are in Windows 11. Can i possibly buy one with Windows 10 already installed?
Buy Alienware Laptop with Windows 10 instead of Windows 11?