It depends

Do I have to buy halal-certified meat?

It depends on where you are and what the alternative actually is. The Qur’an explicitly permits the food of the People of the Book, and on that basis some scholars permit meat from Jewish and Christian butchers in the West. Others hold that industrial slaughter no longer meets the conditions the verse assumed. Both positions are seriously held; which applies to your local supply is the part worth asking about.

The honest answer turns on your circumstances. What it hinges on is below.

The long answer

This is one of the most practically consequential questions a new Muslim faces, and one where a confident single answer would be misleading.

Start with what is not in dispute. Pork is forbidden; carrion is forbidden; an animal dedicated to another deity is forbidden. And this is explicit:

“This day all good foods have been made lawful, and the food of those who were given the Scripture is lawful for you and your food is lawful for them. And lawful in marriage are chaste women from among the believers and chaste women from among those who were given the Scripture before you, when you have given them their due compensation, desiring chastity, not unlawful sexual intercourse or taking secret lovers. And whoever denies the faith - his work has become worthless, and he, in the Hereafter, will be among the losers.” (Qur’an 5:5)

That verse is the root of the disagreement, because it plainly permits the food of the People of the Book — Jews and Christians. The dispute is about whether it still applies to a modern supermarket.

One position: the verse means what it says, so meat from a majority-Christian country is lawful, and a Muslim in the West may buy ordinary supermarket meat other than pork. Scholars holding this often add that you should say bismillāh over it yourself.

Another position: the permission assumed a slaughter performed by a believing butcher who invoked God's name. Industrial processing — mechanical slaughter, stunning that may kill before the cut, no invocation at all — is a different practice from the one the verse permitted, so certified halal meat is required.

A third, widely taken in practice: eat certified halal where it is reasonably available, and rely on the first position where it is not.

What determines your answer: what is actually sold near you, whether the certification available is trustworthy, and whose scholarship you follow.

One thing all positions agree on, and it is a relief to many: a guest is not obliged to interrogate a host. Vegetarian and seafood options sidestep the question entirely, which is why they are what most Muslims order when eating out somewhere uncertain.

What it rests on