Nobuhiko Okamoto is a Japanese voice actor and singer from Tokyo, Japan, affiliated with Raccoon Dog. Previously, he was affiliated with the Pro-Fit agency. He won the Best New Actor Award on Third Seiyu Awards and Best Supporting Actor Award on Fifth Seiyu Awards.

Nobuhiko Okamoto plays as Yuu Nishinoya (voice) in Haikyu!!.
Nobuhiko Okamoto is the top #1 member of the cast and appears in 85 episodes.

Hiroshi Kamiya is a Japanese voice actor, singer and narrator affiliated with Aoni Production. He is best known for being the voice of Choromatsu Matsuno from Osomatsu-san, Takashi Natsume from Natsume Yūjin Chō, Akashi Seijuro from Kuroko's Basketball, Levi Ackerman from Attack on Titan, Mephisto Pheles from Blue Exorcist, Yuzuru Otonashi from Angel Beats!, Yato from Noragami, Nozomu Itoshiki from Sayonara, Zetsubou-Sensei, Koyomi Araragi from the Monogatari series, Sōma from Working!!, Izaya Orihara from Durarara!!, Trafalgar Law from One Piece, Tieria Erde from Mobile Suit Gundam 00, and Kinshirō Kusatsu from Cute High Earth Defense Club LOVE!. He won "Best Lead Actor" and "Best Personality" at the Third Seiyu Awards, and "Best Supporting Actor" at the Second Seiyu Awards. He hosts radio show Dear Girl Stories along with voice actor Daisuke Ono.

Hiroshi Kamiya plays as Ittetsu Takeda (voice) in Haikyu!!.
Hiroshi Kamiya is the top #2 member of the cast and appears in 85 episodes.

Yoshimasa Hosoya is a Japanese voice actor and singer from Hiroshima. He was represented by Mausu Promotion and is now a freelancer. He was also a member of the pop duo MaxBoys along with Toshiki Masuda, a fellow Japanese voice actor. In 2014 & 2016, he won the 8th Seiyu Awards & 10th Seiyu Awards for Best supporting actor. Among his many roles in anime, he voiced Kojou Akatsuki in Strike the Blood, Reiner Braun in Attack on Titan, Fumikage Tokoyami in My Hero Academia, Tamaki Katagiri in Black Bullet, Shichika Yasuri in Katanagatari, Daryun in The Heroic Legend of Arslan, Belial in Granblue Fantasy, and Orga Itsuka in Mobile Suit Gundam: Iron-Blooded Orphans. He also appears in many sports anime as Junpei Hyūga in Kuroko's Basketball, Sosuke Yamazaki in Free! Eternal Summer, Asahi Azumane in Haikyuu!!, Tetsuya Yuki in Ace of Diamond and Otabek Altin in Yuri!!! on Ice. On April 23, 2017, he announced a hiatus to undergo treatment for his throat. On August 4, 2017, he announced his return to voice work.

Yoshimasa Hosoya plays as Asahi Azumane (voice) in Haikyu!!.
Yoshimasa Hosoya is the top #3 member of the cast and appears in 85 episodes.

Koki Uchiyama (内山 昂輝, Uchiyama Kōki, August 16, 1990) is a Japanese actor, voice actor (seiyū) and singer from Saitama Prefecture. He is affiliated with Himawari Theater Group. In 2011, he won Best Rookie Actor at the 5th Seiyū Awards, and in 2015, Best Voice Actor at the Tokyo Anime Awards.

Koki Uchiyama plays as Kei Tsukishima (voice) in Haikyu!!.
Koki Uchiyama is the top #4 member of the cast and appears in 85 episodes.

Kaito Ishikawa is a Japanese voice actor from Tokyo. He is affiliated with Stay Luck (previously with Pro-Fit).

Kaito Ishikawa plays as Tobio Kageyama (voice) in Haikyu!!.
Kaito Ishikawa is the top #5 member of the cast and appears in 85 episodes.

Ayumu Murase is a Japanese voice actor. In 2016, he won 10th Seiyu Awards for Best Male Rookie. Ayumu is his stage name, and his real name is unknown. Whereas Murase is his real surname.

Ayumu Murase plays as Shouyou Hinata (voice) in Haikyu!!.
Ayumu Murase is the top #6 member of the cast and appears in 85 episodes.

Kaori Nazuka is a Japanese freelance voice actress. She usually plays her characters with a signature childlike yet low-and-dignified voice. Nicknamed "Mr. duck". Major appearances are “ .hack // Roots ” (Shino), “ Symphonic Psalm Eureka Seven ” (Eureka), “ Gag Manga Days ” series, “ Silver Olinsis ” (Thea), “ Code Geass Lelouch of the Rebellion ” series (Nanally Lamperouge) etc.

Kaori Nazuka plays as Kiyoko Shimizu (voice) in Haikyu!!.
Kaori Nazuka is the top #7 member of the cast and appears in 85 episodes.

Miyu Irino is a Japanese actor and voice actor from Tokyo. He voices the lead character Sora in the Kingdom Hearts video game series. His major anime voice roles include Todomatsu Matsuno in Osomatsu-san, Haku in Spirited Away, Daisuke Niwa in D.N.Angel, Syaoran Li in Tsubasa Reservoir Chronicle, Sena Kobayakawa in Eyeshield 21, Astral in Yu-Gi-Oh! Zexal, Jintan in Anohana: The Flower We Saw That Day, Yuichiro Hyakuya in Seraph of the End, and Ishida Shouya in A Silent Voice. On June 26, 2009, he released his debut mini-album called Soleil, and in August 2009, Irino played a leading role in the movie Monochrome Girl. His first single album, Faith, was released on November 25, 2009.

Miyu Irino plays as Koushi Sugawara (voice) in Haikyu!!.
Miyu Irino is the top #8 member of the cast and appears in 85 episodes.

Yuu Hayashi (林 勇, Hayashi Yū, born April 2, 1983) is a Japanese voice actor (seiyuu) and singer from the city of Zama, Kanagawa Prefecture. He is affiliated with Ken Production. He began his career as a child actor and was then affiliated with the agency Himawari Theater Group. Since 2013, he has been the vocalist of Screen Mode, a band signed with Lantis. He has blood type AB and is 164 cm tall.

Yuu Hayashi plays as Ryuunosuke Tanaka (voice) in Haikyu!!.
Yuu Hayashi is the top #9 member of the cast and appears in 85 episodes.

Toshiki Masuda is a freelance voice actor previously affiliated with Space Craft.

Toshiki Masuda plays as Chikara Ennoshita (voice) in Haikyu!!.
Toshiki Masuda is the top #10 member of the cast and appears in 85 episodes.