Supreme King Haki is one of the most incredible powers in the world One Piece. It is an ability that only a handful of individuals are born with and even among them, only a few can awaken it. Also known as Conqueror's Haki, this power allows an individual to impose their willpower on others, intimidate them and in some cases even knock them out, provided the difference in strength is huge.
When advanced, Supreme King Haki can be infused into the body, just like Armament Haki, and used for both offensive and defensive purposes. This ability was officially declared in One Piece Chapter 1010 and has since become incredibly important. Over the years, fans have seen some incredible Supreme King Haki feats in One Piece, with some standing out as the very best.

One Piece: 9 Strongest Trios in Grand Line, Ranked
One Piece has some monstrously powerful trios that have conquered the ocean in the Grand Line.
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Zoro Scarring Kaido
Zoro harnessed the power of Supreme King Haki in the Wano Country arc for the very first time. During his fight against Kaido, Zoro was able to unknowingly tap into the Conqueror's Haki, and thanks to the power of his Ashura, he was able to overwhelm the Yonko for a brief second, scarring him across the chest. This is one of Zoro's best achievements in his pirate career, and it was the first time he used Supreme King Haki infusion in battle.
In his fight against King, Zoro was able to radiate this power properly, but the feat of scarring Kaido is the best Haki feat he has.
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Shanks Paralyzes Aramaki From a Distance
Shanks arrived in Wano's sea towards the end of the arc. His main goal was to keep an eye out for Blackbeard. However, he did not appear. Instead, Admiral Green Bull did. Green Bull was fully set on attacking the land of Wano, but Shanks decided to unleash a bolt of Supreme King Haki from several kilometers away.
This bolt traveled through Wano's sky and eventually hit Green Bull. Shanks was even able to communicate with Greenbull with this Haki. How exactly Shanks did this from such a great distance is still unknown.
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Kaido kills Luffy with Horai Hakke
Kaido is still one of the strongest users of Supreme King Haki One Piece, and he showed that throughout the Wano Country Arc. In his fight against Luffy, Kaido showed off what he could really do with his Haki, especially defeating Luffy on several occasions.
Luffy's final defeat in Wano occurred when the Yonko coated his Hasaikai in Supreme King Haki to perform a technique known as Horai Hakke. This ability was so powerful that Luffy simply died after being hit by it. Of course, one must take into account that there was intervention by one of the members of CP0. However, this technique is incredibly powerful.
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Shanks's Divine Departure On Kid
Shanks was also seen in action in the Final Saga of One Piece when he decided to fight Eustass Kid, who was about to attack his fleet. Shanks, in an instant, appeared right in front of Kid and unleashed a powerful Supreme King Haki attack called Divine Departure. This is the same technique that Roger wants to use on Oden.
When Shanks used it, he was able to knock out not only Kid but also Killer at the same time. Additionally, several members of the Kid Pirates were completely knocked out by his Conqueror's Haki, and the rest of the job was done by the Giants of Elbaf.
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Kozuki Oden Scarring Kaido
Kozuki Oden is still one of the strongest Haki users in all One Piece. Odin was reborn during his travels with Roger and Whitebeard. At some point during his travels, he also learned how to infuse Conqueror's Haki into his attacks. During his fight against Kaido, Odin was able to use this incredibly powerful Haki and scar Kaido with it.
Odin could have actually killed Kaido as well, but the distraction caused by Higurashi ensured that he lost. Kaido remained traumatized by Odin's power for decades.

One Piece: 10 Strongest Advanced Haki Users in the Final Saga, Ranked
The Final Saga features many overwhelmed advanced Haki users, and their mastery of the power is on another level.
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Roger and Garp's ultimate techniques on rocks
In the Elbaf arc, Eiichiro Oda showcased the battle between Rocks D. Xebec and the duo Roger and Garp. This battle saw three Haki monsters clash and it was essentially a battle of Supreme King Haki. This clash ended with Roger and Garp using every bit of Haki in their bodies and throwing it at the Rocks when they hit critical mass. Garp used a technique called Infinitum Explosion, while Roger used a technique called God of Fire: Ace. Both of them charged Supreme King Haki to the fullest and they dealt massive damage to Rock's D. Xebec, defeating him in the process.
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Roger And Whitebeard Splitting The Sky
Both Roger and Whitebeard are two of the very best users of Supreme King Haki i One Piece. These two fought many battles during their own Pirate era, and fans got a glimpse of one of those fights during the Odin flashback.
During their fight in Chapter 966, both Roger and Whitebeard Supreme King used Haki Infusion, and their clash was such that everyone around them was blown away. Even the nearby islands were affected by the power of their Supreme King Haki, and the sky split apart. That in itself is proof that their Haki was absolutely immense.
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Luffy's Bajrang Gun
Luffy's Bajrang Gun is one of the strongest abilities that he has in his arsenal. This technique sees the use of his Nika Devil Fruit, and at the same time, advanced Grade Armament and Supreme King Haki. This is an incredibly powerful technique that could crush even Kaido.
The Conqueror's Haki sparks emanating from this technique completely covered Wano's skies and it is surely one of the strongest attacks in the entire series, considering that Luffy can destroy islands with it.
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Imu's Haki at God Valley
In the Elbaf arc, Eiichiro Oda displayed advanced Supreme King Haki on various occasions, and one of the very best displays came when Nerona Imu decided to personally visit Elbaf. Immediately after Imu's entry, his Haki was felt throughout the land. Luffy and Loki referred to this Haki as incarcerated in strength, and what's more, the former even openly stated that he had never known a Haki this strong before, confirming that this Haki surpassed Kaidos and any other Yonko. At full power, Imus Supreme King Haki can even compete with Joy Boy, and even Scopper Gaban confirmed that the legends who fought in the God Valley, such as Garp, Roger, and even Rocks, did not have Haki as strong.
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Joy Boys Haki On Egghead
By far the greatest Supreme King Haki feat in all of history belongs to Joy Boy. This Haki was unleashed through Emet in One Piece Chapter 1122, and it was so strong that it completely split the sky by itself. It also knocked out all the vice admirals in the navy, and on top of that, it even managed to break the covenant of the five elders and send them back to the sacred land of Marijoa. Above all, it caused immense pain to Nerona Imu, who couldn't help but scream as she felt Joy Boy's powers again.
One Piece is available to read via Manga Plus.