Mostly yes, with one asterisk. If you searched "Popeyes Calgary halal", here's what I found. Popeyes' Canadian chicken supply is halal-certified chain-wide by IFANCA, the Islamic Food and Nutrition Council. Almost no other national chain in Canada can say that.
The asterisk: practice is decided store by store. So the store in front of you matters more than the brand on the sign.

What is actually certified
The chicken. IFANCA certifies the Canadian supply chain. So the chicken at a Calgary Popeyes was raised and processed under a named, published standard. That's the strongest evidence there is, and rare in Calgary.
The standout is Popeyes on 17 Ave SW, rated 4.5 on Google. It has IFANCA-certified supply and is confirmed halal by the community halal map too. It's at 1304 17 Ave SW, and it's the first one to check.
The certification doesn't automatically cover the sides, the fryers, or anything a single franchise does differently. Look for the certificate at the counter on your first visit. Thirty seconds of looking beats any website's word.
Why this is not the KFC situation
KFC's halal programme is real but Ontario-only, so in Calgary the answer is no. Popeyes' certification is national and covers the supply chain. So in Calgary the answer starts at yes, then narrows to "confirm your store."
Mary Brown's sits in between: some locations, not others. Three chains, three answers, and the difference is who certified what, and where. The guide to halal certification explains how to read these differences.
How to check your Popeyes in thirty seconds
Ask two things at the counter. Is the chicken here halal? At a certified store, staff answer this all day without blinking. Is the certificate posted? IFANCA paperwork has the issuer's name on it, and stores that have it tend to display it.
If the answers are vague, treat that store as unconfirmed and move on. In Calgary you're never far from another option.

If you wanted fried chicken either way
Calgary's independent halal fried chicken is good enough that Popeyes is a choice, not a fallback.
Cluck N Cleaver at 1511 14 St SW in the Beltline is a halal fried chicken shop with crisp, well-seasoned breading. Seoul Fried Chicken at 2100 4 St SW in Mission switched its Calgary locations to a fully halal menu. Think double-fried Korean wings and drumsticks in soy garlic and gochujang BBQ.
Shenny's does Pili Pili-style crispy chicken and holds a 5.0. Cluck Clucks in Sage Hill covers chicken and waffles. And Chicken On The Way is a Calgary institution. It serves halal-certified fried chicken, has an on-site prayer space, and is confirmed halal on the community halal map.
For grilled and charcoal too, see the halal chicken guide.
Why Popeyes stands out
Of the Calgary halal places I looked at, Popeyes is the only one that names its certifying body: IFANCA, for the Canadian chicken supply, chain-wide. For the rest, "halal" means the kitchen’s own stated practice. That's how it works in nearly every independent restaurant in Calgary, and it's not a criticism. But if you want a halal claim with a name attached, right now there's one answer. It's a fast-food chain.
Add the 17 Ave SW store's 4.5 on Google, and that's a strong answer to a touchy question.
The other chicken spots don't need a certificate to be worth your evening. Barcelos on Aviation Road (rated 4.5), Seoul Fried Chicken (rated 4.5) and Dave’s Hot Chicken at East Hills (rated 4.2) all serve halal chicken across their whole menu. There are 24 halal chicken places in all.
The short version
Popeyes is the rare chain where the halal claim comes with a certifier's name, chain-wide, at the supply level. Check your own store once: a certificate at the counter, or a straight answer from staff. Then you're done. If either is missing, the independents above will feed you better than settling would.
Common questions
Is Popeyes chicken halal in Canada?
Yes, at the supply level. IFANCA certifies the Canadian chicken supply chain-wide. Each restaurant can still vary in practice. So the honest answer is "yes - and confirm your store once."
Which Calgary Popeyes is confirmed halal?
The 17 Ave SW location. It has IFANCA-certified supply and is confirmed by the community halal map too. Other Calgary locations use the same supply chain. Ask at the counter and look for the posted certificate.
Are Popeyes fries and sides halal?
The certification covers the chicken supply. Sides and fryers are store-level questions. Most sides are meat-free. Shared fryers are where your own judgement comes in, same as at every chain.
Is Popeyes better evidence than "the owner is Muslim"?
A different kind, not always better. A named certifier with published standards can be audited, which is rare and valuable. A Muslim-owned kitchen stating its own practice is the norm across Calgary. The certification guide explains how to weigh the two.
Is the Popeyes at Sunridge halal?
The Popeyes beside Sunridge Mall at 3575 20 Ave NE is a takeout-only counter serving the chain's IFANCA-certified halal chicken, as Popeyes does across Canada. The halal part is the chicken: order the sandwich combos or a piece meal, and check the bag before you leave.