The All-Japan judo championships (全日本柔道選手権大会, Zennihon jūdō senshuken taikai^?) is a judo tournament held every year in Japan. The men's tournament is held in Nippon Budokan on 29 April and the women's tournament is held in Yokohama Cultural Gymnasium in April. The Kodokan and All-Japan Judo Federation sponsor the championship.

This tournament has only one open-weight division. Weight distinction is held as All-Japan Selected Judo Championships (全日本選抜柔道体重別選手権大会, Zennihon senbatsu jūdō taijūbetsu senshuken taikai^?) and Kodokan Cup (講道館杯, Kōdōkan hai^?) particularly.

For Japanese Judoka, this is one of the three major judo titles, along with the Olympic Games and World Championships. Since 2011 All Japan Judo Championship is fought with International rules.

Takamasa Anai (穴井 隆将, Anai Takamasa^?, born August 5, 1984 in Ōita, Ōita) is a Japanese judoka.

He began judo at the age of 5.

He is Coached by former world champion and olympic silver medalist Shinichi Shinohara. He won the All-Japan Championships and took the bronze medal at the World Championships in 2009. His greatest achievement to date is winning the 2010 World Champions in Tokyo. Anai's main tournament throws are Harai Goshi, Uchi Mata and O soto gari.

Keiji Suzuki (鈴木桂治, Suzuki Keiji^?, born on June 3, 1980 in Jōsō, Ibaraki, Japan) is a Japanese judoka.

He won the Olympic gold medal in the heavyweight (+100 kg) division in the 2004. He is also a two-time world champion.

He is noted for being a remarkably small judoka in the heavyweight division; he also regularly competes in the light-heavyweight (-100 kg) class.

Suzuki is known as having some of the best ashi waza of all heavyweights.

Suzuki was eliminated in the first round of the 2010 world Judo championship in Yoyogi, Japan via ippon by Janusz Wojnarowicz of Poland.

Ryoko Tani (谷 亮子, Tani Ryōko^?, née Tamura (田村^?); born September 6, 1975) is a japanese female judoka. She is one of the world's most famous and successful judoka. She was born in Fukuoka, Fukuoka. She was an employee at Toyota Motor Corporation, but is now entering politics.

She is commonly known as 'Yawara-chan'or 'Tawara' (from the title character of Yawara!, a popular judo manga). Since she won the International Women's Judo Championships in 1990, 'Yawara-chan' has gone on to win the event every year. She has a record seven world titles and she brought home the 48 kg-category gold medal from Sydney Olympics in 2000 and the Athens Olympics in 2004.

Her 84-match winning streak was finally broken in 1996 by North Korea's Kye Sun Hui. She holds a fourth dan.

In 2003, she married Yoshitomo Tani, an Olympian and professional baseball player then with the Orix Blue Wave (now with the Yomiuri Giants). The reception reportedly cost $3 million.

In Beijing in 2008 Tani, who had not been beaten in a major international competition since the Atlanta Games in 1996, saw her hopes of a third-straight gold evaporate when judges awarded penalty points to Romania's Alina Dumitru after both competitors failed to show much aggression. Looking stunned, Tani fought desperately after the final controversial penalty call, but with only seconds left she had no time to mount an attack.