Sea salt and malt vinegar. I am Canadian and it's a thing.

In Belgium: Tartare or Mayo. Andalouse for the gal, thanks

In the UK: Salt and Vinegar

In both cases: I will have to change seat if you plop yourself in front of me with your poor fries inundated by ketchup. Only the French do that, and it is a Casus Belli in my book.

Mayonnaise

Mayo.

Maybe add some garlic, and bam:

Aioli.

Mayo

Wendy's Frosty

Mayonnaise. Fight me.

Malt vinegar 🇨🇦

Or cheese curds and gravy 🇲🇶

Fry sauce (ketchup+mayo) with pickle juice. 👌

Gravy and squeaky cheese curds

I haven't seen anyone mention nutritional yeast yet, but that's become my go-to seasoning for almost everything; popcorn, pizza, scrambled eggs, bread, ramen, soft pretzels, and of course on fries. So damn good!

(Yes, I realize the name "nutritional yeast" sounds vaguely unpleasant and unappetizing, but I promise it's incredible if you like savory flavors, and it can also be used as a cheese powder substitute in vegan recipes.)

Gravy or curry sauce

Carne Asada, Cheese, Sour Cream and Guacamole

Chili and cheese

Salt and Vinegar.

Never really liked ketchup.

War

No really, that's a thing.

Basically mayo, peanut sauce and diced onions (some add ketchup or curry sauce too, but I don't like that, personally)

Mayonnaise

peanut sauce / satay sauce

nothing beats it

Ranch dressing powder

mustard! its always available and awesome.

More fries. ¯\_(ツ)_/¯

Malt vinegar or brown sauce

Blue cheese dressing

Where I live Zoervleis is a favorite of many. One can get it in any Snackbar.

If it's just fries, then nothing other than salt.

Otherwise, cheese curds and gravy.

Curry sauce

Ranch dressing and Buffalo sauce

Seasoning salt

Green chile and cheese.

Barbecue sauce

Spicy BBQ

Old Bay

chili cheese!!