No - Papa John's is not halal in Calgary, or anywhere else in Canada. I looked into it. The chain makes no halal claim for anything on its Canadian menu. None of its Calgary stores advertises halal meat. The pepperoni, sausage and bacon are regular pork products. If you searched "is Papa Johns halal in Canada" or "is Papa John's halal Canada", the answer is the same.

Is Papa John's halal in Calgary?
No. Papa John's has stores across Calgary, and its Canadian homepage makes no halal claim. A chain that wanted halal customers would say so. This one doesn't. To find stores near you, start with the chain's own store locator.
You may still hear about halal toppings at Papa John's. A few Ontario franchises have advertised halal chicken or beef toppings over the years. But that was each owner's choice, not company policy. No Calgary location advertises halal meat. If a counter tells you otherwise, ask what exactly is halal, who supplies it, and whether it's certified.
Is Papa John's halal in Canada?
Same answer. Most "yes" results online are about other countries. The community halal map, for example, lists nine halal Papa John's. Every one is in Baku, Azerbaijan, where the local franchise says its chicken, beef, sausage and pepperoni are halal. A halal Papa John's abroad tells you nothing about the one on 17th Ave SW.
Is Papa John's chicken halal?
Not in Canada. There's no halal claim, no named supplier and no certificate. Treat the chicken like any regular chicken: not halal. The same goes for the beef and the wings.
What about the cheese or veggie pizza?
The usual workaround is cheese and veggie pizzas. Then the question is the kitchen, not the meat. Every Papa John's pizza goes through one oven and one cut-table, and so does the pork pepperoni. The same hands top both.
For many people, a veggie pizza from a shared kitchen is fine. For the strictest view, it isn't. Check the dough and sauce ingredients against Papa John's Canada's own published information, not a blog post (mine included).
If you do order one, ask for fresh gloves and a clean cutter. Skip the dipping sauces and seasonings unless you've checked their ingredients.

Why there's no halal Papa John's here
It's the same supply-chain problem as the chains with no halal option. A franchise either switches its whole meat line or leaves it alone. Papa John's Canada has left it alone.
Pizza is unusual because one Alberta chain did change from the top. Pizza 73 runs a halal menu with its own halal pepperoni at participating Calgary stores. You have to ask for it. It's still made in a kitchen that also handles regular pepperoni, so it's the same shared-kitchen trade-off. But there's real halal meat on offer.
The actually-halal pizza bench
The full tour is in the halal pizza roundup. For a cheap halal pizza near you, Khan Baba is the budget pick. Halal Pizza Factory is closest to the airport. Here's the short list, all from kitchens with no pork to work around:
Pizza Bae, Montgomery - the best-rated
Pizza Bae on Bowness Road is rated 4.8 and uses 100% halal ingredients. The Donair Pizza pulls people across the city, with the Chipotle Chicken close behind. Reviewers praise the crisp base, light dough and rich sauce. Gluten-free crusts are available. A few mention a burnt bottom, so ask for it lighter if you like.
Carmine's Pizzeria, Northmount - the New York slice
Carmine's on Northmount Dr NW (4.5) is family-run and New York-style. The community halal map marks it fully halal. Get the Mediterranean or the Donair Pie. Order ahead and larges are ready in about 25 minutes.
Khan Baba, Westwinds - pizza with the biryani
Khan Baba in the northeast (4.6) is a halal Pakistani kitchen. The pizza sits next to the biryani and seekh kabab, and reviewers rate both. It's inexpensive, with a hall if you're feeding a party.
Halal Pizza Factory, JacksonPort - the delivery-style order
Halal Pizza Factory near Cityscape and the airport (4.4) puts the answer in its name. The 14-inch square pizza is around $19. One reviewer timed it at fifteen minutes. Add the wings and onion rings, which come out fresh. Stick to the menu.

The short version
No. Papa John's makes no halal claim in Canada, and none of its Calgary stores offers halal meat. The pepperoni is pork. Cheese and veggie is the workaround if you're already there. If you're not, Pizza 73's halal menu is the chain swap. Pizza Bae, Carmine's, Khan Baba and Halal Pizza Factory are why nobody here needs the workaround. For every other chain, see which fast-food chains are halal in Calgary.
Common questions
Is Papa John's halal in Calgary?
No. None of Papa John's Calgary stores advertises halal meat, and the chain makes no halal claim on its Canadian site. The pepperoni, sausage and bacon are regular pork products.
Is Papa Johns halal in Canada?
No. Papa John's Canada runs no halal program. The halal Papa John's you may read about are in other countries, like the ones in Baku, Azerbaijan. A few Ontario franchises have been exceptions, but that's not company policy.
Is Papa John's chicken halal?
Not in Canada. The chain names no halal supplier or certifier for its chicken, so treat it as regular chicken.
Is Papa John's pepperoni pork?
Yes. At Papa John's in Canada the pepperoni, sausage and bacon are regular pork products. They go through the same oven and cut-table as every other pizza.
Is Papa John's cheese pizza halal?
It has no meat, but it's made in a kitchen that handles pork pepperoni all day, on the same oven and cut-table. Many people accept that; the strictest don't. Ask for fresh gloves and a clean cutter if you order one.
What is the halal alternative to Papa John's in Calgary?
For a chain, Pizza 73 runs a halal menu with halal pepperoni if you ask for it, though its kitchen also makes regular pepperoni. For fully halal kitchens, try Pizza Bae (4.8), Carmine's, Khan Baba or Halal Pizza Factory.
Where is the best halal pizza in Calgary?
Pizza Bae in Montgomery is the best-rated I found, at 4.8, and it's known for its Donair Pizza. The halal pizza roundup ranks the rest.