Yes. Anyone you send the link to can open an Anyone with the link or Public wishlist without creating an account or signing in. The one exception is an Invite only wishlist.

New wishlists are Anyone with the link by default, so the link works for everyone you share it with.

People who view without an account get a temporary guest session. That matters if they reserve something. Sign up in that same session, without switching device or browser, and the reservation moves to the new account. Reserve in one place and sign up in another and it won't follow.

An Invite only wishlist doesn't open for just anyone. If someone isn't signed in, or wasn't invited, they get a "No Access" page saying the owner has restricted access. To share a wishlist like that, invite people by email. See "How do wishlist privacy settings work?"

Curious what a guest can actually do once they're in? See "What can guests do on my wishlist?"