The Samsung Galaxy S21 Ultra may be approaching two years old, but it’s still a powerhouse. The S21 Ultra’s cameras, display, and overall performance are as good now as when the phone was released in 2021. In addition, the wrap-around camera bump is arguably better looking than what we find on its successor, one of the best Android phones on the market.
The S21 Ultra may not have a built-in S Pen like the Samsung Galaxy S22 Ultra, but it does support the stylus, and plenty of cases out there will hold one. Like most modern phones, the S21 Ultra is a metal and glass sandwich that demands protection. That’s why we’ve collected the best cases available to do just that.
The Samsung Galaxy S21 Ultra is now three years old and in that time it has aged like a fine wine. It’s one of the best flagships Samsung has made, certainly the best looking in recent times, and people who are using an S21 Ultra today will likely continue to do so for a while longer. It’s no wonder that the S21 Ultra and its successors have made it onto our list of the best Android phones on the market.
The S21 Ultra doesn’t have the built-in S Pen that the S24 Ultra does, but it does support the stylus, so if you want to carry an S Pen, you’ll need a case to hold it. Likewise, you’ll want to make sure you keep the phone itself safe from drops or bumps, and a case will provide that security.
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Spigen Cryo Armor for Galaxy S21 Ultra
Best overallCryo Armor uses Air Cushion Technology to keep your phone safe from drops and knocks while also keeping your phone cool. Inside the case is a layer of thermally conductive silicone, and the outside has vents that expose this layer to the air. So, as your phone heats up, the silicone layer pulls some heat away from the phone and vents it out of the back.
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Otterbox Prefix for Galaxy S21 Ultra
Premium pick$22 $25 Save $3Otterbox cases are known for extreme protection at the expense of a bulky design, and the Prefix series turns that on its head. The protection is still top-notch, but the port covers are gone, and the front lip has been shrunk to keep the case slim. The sides of the case are made of a soft TPU that adds plenty of grip, while the back is made from transparent hard plastic for most of the finishes.
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Goospery Liquid Silicone Case for Galaxy S21 Ultra
Best valueThis soft yet protective case is made from premium liquid silicone and polycarbonate. The inside has a microfiber lining to keep your Galaxy S21 Ultra as scratch free as the day you got it. Moreover, this Goospery case won’t add any additional bulk to your device and goes on quickly and easily. It’s available in eight different colors, so there is sure to be one that you love.
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Supcase Unicorn Beetle Pro for Galaxy S21 Ultra
Promoted pickIn partnership with Supcase
The Supcase Unicorn Beetle Pro is one of the best cases on the market for extreme protection, and that’s with good reason. The dual-layer construction ensures your S21 Ultra will be safe and sound, and the sturdy kickstand makes media consumption a breeze in landscape or portrait. Our favorite part of this case is the S Pen holder on the side, making quick note-taking easier than ever.
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i-Blason Cosmo for Galaxy S21 Ultra
Promoted pickIn partnership with i-Blason
The Cosmo combines two-layer construction, thinness, and top-notch protection in one package. The front layer keeps your screen safe while retaining compatibility with screen protectors, and the back cover surrounds the camera to prevent lens scratches. The back of the case is made from a flexible TPU that’s hard enough to take damage but soft enough to nestle comfortably into your hand. The stand-out feature of the Cosmo is, as always, the striking design.
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MXX Body Bumper for Galaxy S21 Ultra
The MXX Body Bumper uses a three-layer construction to absorb any impact and prevent it from damaging your phone. Port covers keep dust out of your ports, and a raised bezel prevents your screen from taking damage while leaving room for a screen protector. Many protective cases feature aggressive designs, and while these can look good, many prefer something more understated, and the Body Bumper does just that.
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Speck Presidio2 Grip for Galaxy S21 Ultra
The Presidio2 Grip lives up to its name. The case has ridges that wrap around from the back onto the edges that add grip, making the Presidio2 a difficult case to drop. The whole thing is made from soft-touch plastic, which adds even more grip and makes everything more comfortable to hold. A lip around the front keeps the display scratch-free, and air cushions around the inside of the case frame and on the corners will absorb the kinetic energy from any drops or knocks. The Presidio2 Grip is available in Black, Gray, and Blue.
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Otterbox Symmetry for Galaxy S21 Ultra
The Otterbox Symmetry is a thick case designed to keep your S21 Ultra safe from anything you throw at it. A thick lip surrounds the display and rear cameras, ensuring both remain scratch-free when you set the device on a table. Covers ensure that your USB-C port is secured against dust and other ingress, and the case features shock absorption to dissipate the kinetic energy from any impact.
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Spigen Liquid Air P for Galaxy S21 Ultra
$18 $25 Save $7Spigen’s excellent Liquid Air P adds an S Pen silo to the phone’s left side. If you’re a hardcore S Pen user, that sacrifice is worth it to have the stylus readily available. Aside from the S Pen, you benefit from everything that makes the Liquid Air one of our favorite cases. A slim, good-looking design with plenty of grip, and solid protection against drops.
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Torras Shockproof for Galaxy S21 Ultra
The Shockproof Case from Torras offers insanely good drop protection. Torras tested it by dropping it over 2,500 times at a height of six feet. The back is made of polycarbonate, while the sides are made from TPU. And thanks to the oleophobic coating, this case is resistant to fingerprints and oils. To keep the overall size of the S21 Ultra as small as possible, Torras designed this case as thin as possible.
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Casetify Impact Case for Galaxy S21 Ultra
Sometimes you want a bit of protection but not at the expense of the size of an already large device. The Casetify Impact Case for the Galaxy S21 Ultra is slimmer than a dime, making it one of the thinnest cases on this list. Made from polycarbonate and TPU, this case provides adequate protection from minor scrapes and scuffs.
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Case-Mate Case for Galaxy S21 Ultra
$4 $9 Save $5This Case-Mate Case comes in a variety of colors and styles, but the Twinkle Ombre is by far the best one for your Galaxy S21 Ultra. Featuring a back with glitter foil, this case can withstand drops from as high as 10 feet. It also has an anti-scratch coating, allowing your case to look great for a long time.
Keep your phone in tip-top shape
Keeping your Galaxy S21 Ultra protected goes a long way to increasing the life of your device. The Spigen’s Cryo Armor does that by keeping your phone safe and cool. A thermally conductive layer pulls some of the heat out of your phone to keep it cooler for longer. How much benefit that provides is debatable, but it looks cool. The protection that really matters is here as well. In fact, this case is so durable it allowed an iPhone to survive a drop from an airplane earlier this year. No doubt Spigen will be quick to remind people of this, but that’s understandable for such an impressive feat.
If you want something with a solid reputation and robust protection, the Otterbox Prefix series gives you all of that without the bulk typically associated with Otterbox cases. Go with the Goospery Liquid Silicone Case if you want something less expensive but still valuable, as it provides decent protection in vibrant colors. But if you want a stronger case, the Supcase Unicorn Beetle Pro will keep your S21 Ultra safe from anything life throws at it. It’s rough and ready, plus it includes useful features like the best kickstand possible and an S Pen slot.
Lastly, with the S21 Ultra being a big phone, a thin case is the best way to keep it safe without making it an unmanageable brick. The Speck Presidio2 Grip, Torras Shockproof, and Casetify Impact offer solid protection without being too bulky.
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