The Samsung Galaxy S21 Ultra remains one of the best Android phones we've tested here at XDA. It may not be our first pick for a smartphone in 2024 — nor is it readily available now — but it remains a reliable phone, and it holds up very well in 2023 against other flagships on the market. It recently received the Android 14 update as well, so it's still relevant in the Android space in 2024. It's also arguably a better-looking phone compared to its successor, the Galaxy S22 Ultra, thanks to its beautiful glass sandwich design and the wrap-around camera bump. It's also just as fragile as a lot of other flagships on the market right now, which is why I recommend picking up a case to protect it from accidental drops and scuffs.

  • A render showing the Spigen Ultra Hybird installed on a Samsung Galaxy S21 Ultra in blue color.
    Spigen Ultra Hybrid for Galaxy S21 Ultra
    Editor's Choice

    The Spigen Ultra Hybrid is a relatively thin case that offers decent protection for your device while letting you show off its colors. You can also get a version of this case that comes with black-colored bumpers.

  • A render showing Caseology Nano Pop installed on a Samsung Galaxy S21 Ultra.
    Caseology Nano Pop for Galaxy S21 Ultra
    Best value pick

    The Caseology Nano Pop is one of the best cases out there that offers a good amount of protection to the phone without adding too much bulk. It's also a stylish case that's available to purchase in some eye-catching colors.

  • A render showing the Venito Lucca leather case installed on a Samsung Galaxy S21 Ultra.
    Venito Lucca leather case for Galaxy S21 Ultra
    Premium leather case

    If you're looking for a premium case for the Galaxy S21 Ultra, then look no further than the Venito Lucca leather case. It features handcrafted premium leather at the back that's available in a bunch of different finishes. It also comes with suede inner lining and a hard shell bumper for the best protection.

  • A render showing Supcase Unicron Bettle Pro installed on a Samsung Galaxy S21 Ultra.
    SUPCASE UB Pro Galaxy S21 Ultra Case
    Promoted pick

    In partnership with Supcase

    The SUPCASE Unicorn Beetle Pro is an affordable rugged case for the Galaxy S21 Ultra. In addition to protecting your device from accidental drops and scuffs, it also offers some extras like a kickstand to help you prop it up in both landscape and portrait orientations and a rotatable holster to secure your phone on your belt.

  • A render showing the dbrand Grip case installed on a Galaxy S21 Ultra.
    dbrand Grip case for Samsung Galaxy S21 Ultra
    Rugged & Customizable

    The dbrand Grip case is one of the best customizable out there on the market. You can pick one of the available skins and customize it to your liking. It also offers a good amount of protection, along with textured grip around the frame to help you get a good grip on it.

  • A render showing the Otterbox Symmetry case with Stardust Glitter finish installed on Samsung Galaxy S21 Ultra.
    OtterBox Symmetry for Samsung Galaxy S21 Ultra
    Best stylish case

    The OtterBox Symmetry case is available in a bunch of different finishes, including a stylish option called Stardust Glitter. This case offers great drop protection, and it has raised edges for both the screen and the display. 

  • A render showing the Speck Presidio 2 Grip case installed on a Galaxy S21 Ultra.
    Speck Presidio2 Grip case for Galaxy S21 Ultra
    Best grip case

    The Speck Presidio 2 Grip is perfect for those who are looking to buy a reliable rugged case that offers good drop protection for their phone. The highlight of this case, however, is its grippy texture that spreads across body, covering the back and its frame.

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    Arae Wallet Galaxy S21 Ultra case
    PU leather folio case

    You want a wallet case? Arae case has it for you. You'll be able to store a number of cards in this tri-fold case, and it can even prop up your phone! Just make sure to get a screen protector, so your cards don't scratch the screen!

  • A render showing the imluckies protectve case installed on a Samsung Galaxy S21 Ultra.
    Imluckies Galaxy S21 Ultra Case with Camera Cover
    With camera lens protector

    The Galaxy S21 Ultra's camera setup is pretty amazing, so you might want to consider a case that protects it. Imluckies' case has a slider that can cover your phone's cameras when not in use. Just slide it away when you want to take a picture and you're good to go.

  • A render showing the TORRAS Shockproof slim case for Galaxy S21 Ultra
    TORRAS Shockproof case for Galaxy S21 Ultra
    Best thin case

    This particular case from TORRAS is among the thinnest cases out there for the Galaxy S21 Ultra. It's available in a few different colors, all of which add very little bulk to the device overall.

  • A render showing the Spigen Thin Air P case installed on a Galaxy S21 Ultra in black color.
    Spigen Liquid Air P case for Galaxy S21 Ultra
    Built-in S Pen holder

    This Spigen case for the Galaxy S21 Ultra comes with a built-in S Pen holder that lets you easily carry the accessory. It also has an anti-slip matte surface at the back that helps you get a good grip on the phone, and it also offers a good amount of protection to the phone.

  • A render showing the GOOSPERY silicone case installed on a Galaxy S21 Ultra.
    GOOSPERY Liquid Silicone case for the Galaxy S21 Ultra
    Simple silicone case

    This simple silicone case has a soft-touch finish at the back and it also comes with soft microfiber lining inside. It's available in a few different colors, all of which offer a good amount of protection to the phone.

Closing thoughts

Those are some of the best cases you can buy for the Galaxy S21 Ultra in 2024. I'd personally pick Spigen's Ultra Hybrid case for it as it adds a decent amount of protection while letting you show off the color of your device. If you plan on using an S-Pen with your phone, then you might want to consider buying Spigen's Liquid Air P. It's the only decent option out there that lets you safely tuck the S-Pen. I've also highlighted some other options, including the Caseology Nano Pop and the Vennito leather case, so be sure to explore them.

A render of the Samsung Galaxy S21 Ultra in black color.
Samsung Galaxy S21 Ultra

The Samsung Galaxy S21 Ultra isn't readily available to purchase directly from Samsung, but you can still pick up a renewed unit from one of the retailers. Hit the link below to find the best price for it online right now.