The Nihon Sumo Kyokai defines its departments as follows:

• Crisis Management Team (CMT): Primarily seeks to prevent hazing and other scandalous happenings.
• General Enterprises: Strategy and planning.
• Guidance: Training in sumo tradition and techniques, publishing materials for sumo-do guidance, etc. Shisho are always members of this department.
• Information: Handling domestic and international public relations. Also supervises the recording, production and handling of images.
• Jungyo: Handling regional tours.
• Lifestyle Guidance: Proper guidance for the lifestyles of Kyokai members.
• KHO: Kyokai Head Office, i.e. the oyakata has an office in the Kokugikan and is usually resident there.
• Operations: Handling hon-basho and daily business in Tokyo.
• Regional Basho: Handling regional hon-basho in Osaka, Nagoya, Fukuoka.
• Shimpan: Handling hon-basho matches, as well as the making of torikumi. (Until 2014 only for Iin, now also Shunin allowed.)
• Shindeshi Examination Supervisor: Supervises the health examinations of the new recruits.
• Social Contribution: Disaster relief, fundraising for charitable donations, etc.
• Sumo Competition Inspection Committee (SCIC): Organization aiming to prevent, inspect and discipline spiritless sumo in hon-basho.
• Sumo Museum: Mainly researches sumo, exhibits, handles and stores sumo materials, and publishes sumo materials.
• Sumo Training School: Facilities for guiding and training newly registered rikishi for six months.

Other titles/departments used in the list:

• Auditor: External controllers/comptrollers of the Kyokai.
• Councillor: External and internal councillors of the Kyokai who act as a "supervisory board" for the rijikai. Even the internal councillors are (nominally) independent from NSK authority.

The following is a list of oyakata with their ranks and the departments they are assigned to (last update: 2018 Apr 03).

RIJICHO (CHIEF EXECUTIVE DIRECTOR)
Hakkaku	Managing Director
RIJI (EXECUTIVE DIRECTORS)
Oguruma	Operations Director, Chairman Of The National Supporters' Committee, Museum Committee Member, KHO
Kagamiyama	Guidance Director, Lifestyle Guidance Director, CMT Director, Museum Committee Member, KHO
Sakaigawa	Regional Basho Director (Fukuoka)
Kasugano	Jungyo Director, SCIC Chairman, Security Head Office Director, KHO
Dewanoumi	Regional Basho Director (Nagoya)
Shibatayama	Information Director, General Enterprises Director, Museum Committee Member, KHO
Hanakago	Jungyo Vice-Director, Security Head Office Vice-Director, Shindeshi Examination Supervisor, Regional Basho (Fukuoka)
Yamaguchi Toshikazu#	External Executive Director, Auditor
Imai Tamaki	External Executive Director, Auditor
Takano# Toshio	External Executive Director, Auditor, CMT member
KANJI (NON-EXECUTIVE DIRECTORS)
Okabe ...	External Non-Executive Director, Auditor
Kajiki ...	External Non-Executive Director, Auditor
Fukui Ryoji#	External Non-Executive Director, Auditor
FUKURIJI (NON-EXECUTIVE/VICE DIRECTORS)
Fujishima	Operations Vice-Director, Shimpan Vice-Director, Vice-Chairman of Doping Prevention Committee, Museum Committee Member, Shindeshi Examination Supervisor, KHO
Takadagawa	Shimpan Vice-Director, Vice-Chairman of Doping Prevention Committee, Shindeshi Examination Supervisor
Wakamatsu	Shimpan Vice-Director, Vice-Chairman of Doping Prevention Committee, Shindeshi Examination Supervisor
YAKUIN TAIGU IIN (EXECUTIVE OFFICERS)
Michinoku	Guidance Vice-Director
Irumagawa	Jungyo, Guidance
Nishikido	Guidance
Sadogatake	SCIC, Guidance
Katsunoura	Gate
IIN (SENIOR OFFICERS)
Isegahama	Guidance
Yamahibiki	Guidance
Nakadachi	Guidance, Lifestyle Guidance, KHO
Kabutoyama	Sumo Training School, Guidance (Kimarite)
Inagawa	Sumo Training School, Guidance (Kimarite)
Arashio	Guidance
Jinmaku	Guidance
Oitekaze	Guidance
Tatsunami	Guidance
Kumegawa	Guidance
Shikoroyama	Guidance
Kise	SCIC, Guidance
Otake	SCIC, Guidance
Musashigawa	SCIC, Guidance
Minato	Shimpan, Guidance
Tamanoi	Shimpan, Guidance
Onaruto	Shimpan, Guidance
Kokonoe	Shimpan, Guidance
Kataonami	Shimpan, Guidance
Asakayama	Shimpan, Guidance
Tatekawa	Shimpan, Guidance
Tagonoura	Shimpan, Guidance
Urakaze	Shimpan, Guidance
Takenawa	Shimpan, Guidance, Social Contribution
Futagoyama	Shimpan, Guidance
Azumazeki	Shimpan, Guidance, Social Contribution
Hanaregoma	Shimpan, Guidance, Social Contribution
Isenoumi	Regional Basho (Osaka), Guidance, KHO
Fujigane	Regional Basho (Osaka), Guidance
Shiratama	Regional Basho (Osaka), Guidance
Hatachiyama	Regional Basho (Osaka), Guidance, Social Contribution
Tatsutayama	Regional Basho (Nagoya), Guidance, KHO
Wakafuji	Regional Basho (Nagoya), Guidance
Iwatomo	Regional Basho (Nagoya), Guidance, Social Contribution
Tamagaki	Regional Basho (Fukuoka), Guidance
Yamawake	Regional Basho (Fukuoka), Guidance
Mihogaseki	Regional Basho (Fukuoka), Guidance, Social Contribution, KHO
Ikazuchi	Regional Basho (Fukuoka), Guidance
Edagawa	Jungyo, Guidance
Onoe	Jungyo, Guidance
Tanigawa	Jungyo, Guidance
Sendagawa	Jungyo, Guidance, Shimpan
Shikihide	Jungyo, Guidance
Matsugane	Jungyo, Guidance
Asahiyama	Shimpan, Jungyo, Guidance
Hamakaze	Gate
Sekinoto	Gate, Social Contribution
Takasaki	Information, Guidance, Social Contribution, KHO
Naruto	Information (Press Club)
Shiranui	Regional Basho (Osaka), Guidance, Social Contribution
Tatsutagawa	Jungyo, Guidance
Oshima	Shimpan, Guidance
Nishiiwa	Shimpan, Guidance
Takasago	Sumo Training School, Guidance (Kimarite)
Onomatsu	Sumo Training School, Guidance (Kimarite), Social Contribution
Onogawa	Guidance, Social Contribution
Tokitsukaze	Guidance, Social Contribution
Kumagatani	Guidance, Social Contribution
SHUNIN (OFFICERS)
Oshiogawa	Guidance
IIN TAIGU TOSHIYORI (ACTING SENIOR OFFICERS)
Nishonoseki	Information (Press Club), Social Contribution
Takekuma	Information (Press Club), Social Contribution, Guidance
Hidenoyama	Social Contribution, Guidance
Kakuryu	Social Contribution, Guidance
Miyagino	Guidance
TOSHIYORI (JUNIOR OFFICERS)
Nakagawa	Shimpan, Guidance
Tokiwayama	SCIC, Guidance
Ajigawa	Guidance
Nakamura	Guidance
Tateyama	Guidance
Arashio	Guidance
Kiyomigata	Guidance
Chiganoura	Guidance, Social Contribution
Matsuchiyama	Guidance, Social Contribution
Yamashina	Guidance, Social Contribution
Kasugayama	Guidance, Social Contribution
Tomozuna	Guidance
Kimigahama	Guidance
TOSHIYORI KARIKABU (JUNIOR OFFICERS - KABU ON LOAN)
Furiwake	Jungyo, Guidance, Social Contribution
Dekiyama	Guidance, Social Contribution
Nishikijima	Guidance, Social Contribution
Sanoyama	Guidance, Social Contribution
Kitajin	Guidance
Kiriyama	Guidance
Oyama	Guidance
SANYO (CONSULTANTS - RE-EMPLOYED OYAKATA AT AGE 65-70)
Minezaki	Guidance
Minatogawa	SCIC, Guidance
Araiso	Guidance
Magaki	Guidance
Takashima	Guidance
HYOGIIN (COUNCILLORS)
Ikenobo Yasuko	External Councillor
Ebisawa Katsuji	External Councillor
Takino Kinya	External Councillor
Kimura Keiji	External Councillor
Morita Takeo (former Fujinokawa)	Internal Councillor
Ishida Yoshikazu (former Washuyama)	Internal Councillor
Ozuka Hajime (former Asanosho)	Internal Councillor