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The best Samsung Galaxy S21 Ultra thin cases you can buy

If you're going to grab a large phone, you may want a slim case.
November 17, 2022
Samsung Galaxy S21 Ultra back in hand 5
David Imel / Android Authority

Our quick picks for the best thin Samsung Galaxy S21 Ultra cases:

The Samsung Galaxy S21 Ultra is a 6.8-inch beast that’s sure to dominate your pocket space. However, you’ll still have to find a way to keep your new $1,200 device safe from harm. Luckily for you, there are plenty of thin and light ways to do just that. Here are our picks for the best Samsung Galaxy S21 Ultra thin cases you can buy.

See also: Samsung Galaxy S21 buyer’s guide

Looking for more ways to keep your phone safe and get the most out of it? Don’t forget to check out our guide for the best case brands to look at and mobile accessories you can get!

Android Authority’s parent company, Authority Media, also owns PHNX.

Best Samsung Galaxy S21 Ultra thin case: Spigen Thin Fit

spigen thin fit
Samsung Galaxy S21 Ultra Spigen Thin Fit
The Spigen Thin Fit is a thin and light case that will help keep the phone scratch-free. For drop protection, you might want to check out the more protective cases on this list.


  • Thin and light
  • Tactile button covers
  • Precise cutouts


  • Not as protective
  • Only one color option (black)
  • Not the easiest to remove

If you’re looking for a thin and light case, this case’s name is self-explanatory. The Spigen Spigen Thin Fit is a polycarbonate case that snaps onto the phone. It comes with a raised camera bump, button covers, and precise cutouts for everything else. Despite being a hardshell case, it also offers an impressive grip. That said, it’s not the best option if you’re particularly clumsy. However, it can manage the occasional bump or drop.

Looking for more thin Samsung Galaxy S21 Ultra case options? We also recommend:

ringke air s thin case for the samsung galaxy s21 ultra

The Ringke Air-S looks like the Thin Fit but is a great soft TPU alternative with a matte finish for extra grip. You also have a few color options to choose from — black, lavender, and pink sand.

Buy now on Amazon

PHNX mnml Galaxy S21 Ultra thin case

If you want the thinnest S21 Ultra case around, check out the PHNX thin case. It’s just .35mm thin, making it super light. However, beyond a raised lip around the camera, it doesn’t provide much drop resistance, so you’ll need to be careful.

Get 20% off with the discount code: AAPHNX20

Buy now from PHNX

spigen rugged armor

The Rugged Armor is a great TPU option that relies on Spigen’s Air Cushion Technology for shock absorption. It’s yet another matte black case, though the carbon fiber details add a premium touch.

Buy now on Amazon

speck presidio2 grip

Speck’s Presidio2 Grip features a blanket of raised tactile ridges on the back panel that should help you keep a tight grip. The case can handle falls from up to 13ft and a layer of Microban keeps germs at bay.

Buy now on Amazon

galaxy s21 ultra caseology nano pop

You’ll find more cases in matte black than you probably care to count, but the Nano Pop is a great way to add a little color to your premium flagship device.

Buy now on Amazon

esr metal kickstand case

Go hands-free while binging your favorite shows with the ESR metal kickstand case. The sturdy metal kickstand will let you prop the phone up in both landscape and portrait.

Buy now on Amazon

encased duraclip with kickstand and belt clip holster

The Encased Duraclip is another great way to add a kickstand to your phone. Encased also includes a belt holster with its Duraclip just in case you can’t fit the Galaxy S21 Ultra in your pocket.

Buy now on Amazon

official samsung silicone cover for the galaxy s21 ultra

The thin official case for Samsung’s Galaxy S21 Ultra consists of one flexible piece of material and it comes in four different colors to match your new device. It also covers a bit of the camera housing for an even cleaner look.

Buy now on Amazon