What do you call this thing?

"buckle" (or "clasp")

Buckle.

I think I’d most likely call it a clip. But also all of the other answers.

I just call it a clip, but I'm guessing that's not the correct terminology.

A side release buckle. [https://en.wikipedia.org/wiki/Buckle#Side\_release\_buckle](https://en.wikipedia.org/wiki/Buckle#Side_release_buckle)

Snap, clasp, buckle, clip.

Side-release buckle or Fastex buckle (brand name of the first side-release buckles, before there were knock-offs). I have heard people call it a clip (especially the smaller ones on a sternum strap).

Buckle

A safety fastener

That is a "buckle"

Out of curiosity, how do you call it in your langauge?

To all those saying "clasp" I'm intrigued. A clasp in my mind needs either a hinge or a claw like grip.

I wouldn’t call this a buckle. A buckle to me is the mechanism you find on a traditional leather belt. I’d probably call it a clasp.

Holy moly. I’ve been learning english since I was four. And it has never crossed my mind that I don’t know such basic thing xd

At least in US English it's a buckle. I would never refer to this as a clip as some are saying. But that might be a US vs UK English thing.

When I Google the image, it says it's a (side-release) buckle. What result did you get that confused you?

Buckle, clip, or clasp.

I dont even know how to call that thing in my mother tongue

as a whole, it's a buckle, but you may want to also refer to the two parts separately. > There's a buckle at the bottom; push the connector into the socket until it clicks into place.

Fastex

A clip maybe? Clasp?

The brand name is Fastex buckle.

I always called them "pinch clips" but I know thats wrong

Buckle. My dog’s harness has two and when we get home from a walk, I’m often saying “stay still, I need to undo your buckles” or “let me unclip your straps.” So, maybe ‘clips’ in some instances, too.

Fasten buckles 😉

buckle

Buckle. It's a belt buckle.

I just bought one & it was labeled a 'side squeeze buckle'.

Buckle or snap buckle

My immediate thought was a latch, but buckle seems more fitting.

Thingybob is the correct term for it.

Buckle

buckle, clasp, maybe clip, too

Buckle or clip

a clitchet

Buckle or clip

"Buckle", although it might be referred to as a clasp elsewhere.

Clasps, buckles, snaps

Buckle or I've heard this particular kind distinguished from other buckles as a "flat buckle."

Usually it's called a buckle. But in an inventory, it is usually labelled as a 'side release buckle' or a 'side release snap buckle'. There are many types of similar buckles you see. So they gave names of each type. At least that's what it's called from the factory I've seen. Maybe other factories have different names for it. That I can't be sure of.

Buckle/clasp