The answer to this is based on whether Squid are considered Fish or not. You can read more on Seafood Fiqh here.

Squid are not from the fish species. According to Britannica.com, “Mollusks are soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.”

This includes Clams, Mussels, Oysters, Scallops, Octopus and Squid.

Considering Squid is not a fish they will be considered haram under the Hanafi School.

The other three schools consider Squid to be halal.

Squid is also known as calamari.

You may also be interested in:

• The ruling of Seafood in Islam
• Are Scallops halal?
• Is Octopus halal?
• Are Crabs/Lobster halal?
• Is Turtle halal?
• Are Frogs halal?
• Is Squid halal?
• Are Prawns and shrimp halal?
• Is Shushi halal?
• Are Sharks and Whales halal?

You can read more on halal:

• What is Halal?: An Overview
• Importance of Halal
• General Halal Food guidelines
• The ruling of Seafood in Islam
• Halal and Haram animals according to the Hanafi School
• What parts of a Halal animal are impermissible to eat?
• Gelatine in Islam
• Animal Rennet in Islam
• Carmine in Islam
• Artificial Bacon in Islam
• Islamic Ruling of Kosher foods