I have a glacier Bay shower faucet and cannot find a replacement handle.

I believe Glacier Bay is a Home Depot brand. Try there.

Sometimes the vendor will give parts to the plumbing department. Try taking the handle into Home Depot and they might be able to help you.

Keep in mkind that there really isn't a Glacier Bay company. This house brand name is used exclusively by Home Depot for faucets made by Globe Union, read this thread for more details https://www.askmehelpdesk.com/plumbing/glacier-bay-web-site-39098.html Home Depot is the place to start since they of all stores should have replacement handles. You can also try to contact Globe directly.