The Nihon Sumo Kyokai defines its departments as follows:

Other titles/departments used in the list:

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)
HakkakuManaging Director
RIJI (EXECUTIVE DIRECTORS)
OgurumaOperations Director, Chairman Of The National Supporters' Committee, Museum Committee Member, KHO
KagamiyamaGuidance Director, Lifestyle Guidance Director, CMT Director, Museum Committee Member, KHO
SakaigawaRegional Basho Director (Fukuoka)
KasuganoJungyo Director, SCIC Chairman, Security Head Office Director, KHO
DewanoumiRegional Basho Director (Nagoya)
YamahibikiSumo Training School Director
ShibatayamaInformation Director, General Enterprises Director, Museum Committee Member, KHO
OnomatsuShimpan Director, Chairman of Doping Prevention Committee, Shindeshi Examination Supervisor
TakashimaRegional Basho Director (Osaka)
Yamaguchi Toshikazu#External Executive Director, Auditor
Imai TamakiExternal Executive Director, Auditor
Takano# ToshioExternal 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)
FujishimaOperations Vice-Director, Shimpan Vice-Director, Vice-Chairman of Doping Prevention Committee, Museum Committee Member, Shindeshi Examination Supervisor, KHO
HanakagoJungyo Vice-Director, Security Head Office Vice-Director, Shindeshi Examination Supervisor, Regional Basho (Fukuoka)
IzutsuJungyo Vice-Director, Security Head Office Vice-Director, Shindeshi Examination Supervisor
YAKUIN TAIGU IIN (EXECUTIVE OFFICERS)
TakasagoSCIC Vice-Chairman
NishonosekiGuidance Vice-Director
MichinokuGuidance Vice-Director
IsegahamaSumo Training School Vice-Director
YamashinaSCIC Vice-Chairman
NishikidoShimpan Vice-Director, Vice-Chairman of Doping Prevention Committee, Shindeshi Examination Supervisor
TakadagawaShimpan Vice-Director, Vice-Chairman of Doping Prevention Committee, Shindeshi Examination Supervisor
IIN (SENIOR OFFICERS)
NakadachiGuidance, Lifestyle Guidance, KHO
KabutoyamaSumo Training School, Guidance (Kimarite)
InagawaSumo Training School, Guidance (Kimarite)
MinezakiGuidance
ArashioGuidance
MiyaginoGuidance
JinmakuGuidance
OitekazeGuidance
TatsunamiGuidance
KumegawaGuidance
ShikoroyamaGuidance
MinatogawaSCIC, Guidance
ChiganouraSCIC, Guidance
KiseSCIC, Guidance
SadogatakeSCIC, Guidance
OtakeSCIC, Guidance
MusashigawaSCIC, Guidance
NakagawaShimpan, Guidance
MinatoShimpan, Guidance
TamanoiShimpan, Guidance
OnarutoShimpan, Guidance
KokonoeShimpan, Guidance
KataonamiShimpan, Guidance
AsakayamaShimpan, Guidance
TokitsukazeShimpan, Guidance
AzumazekiShimpan, Guidance
TatekawaShimpan, Guidance
TagonouraShimpan, Guidance
UrakazeShimpan, Guidance
TakenawaShimpan, Guidance, Social Contribution
FutagoyamaShimpan, Guidance
FuriwakeShimpan, Guidance, Social Contribution
HanaregomaShimpan, Guidance, Social Contribution
IsenoumiRegional Basho (Osaka), Guidance, KHO
FujiganeRegional Basho (Osaka), Guidance
ShiratamaRegional Basho (Osaka), Guidance
HatachiyamaRegional Basho (Osaka), Guidance, Social Contribution
TatsutayamaRegional Basho (Nagoya), Guidance, KHO
WakamatsuRegional Basho (Nagoya), Guidance
WakafujiRegional Basho (Nagoya), Guidance
IwatomoRegional Basho (Nagoya), Guidance, Social Contribution
TamagakiRegional Basho (Fukuoka), Guidance
YamawakeRegional Basho (Fukuoka), Guidance
MihogasekiRegional Basho (Fukuoka), Guidance, Social Contribution, KHO
IkazuchiRegional Basho (Fukuoka), Guidance
IrumagawaJungyo, Guidance
EdagawaJungyo, Guidance
OnoeJungyo, Guidance
TanigawaJungyo, Guidance
SendagawaJungyo, Guidance, Shimpan
ShikihideJungyo, Guidance
MatsuganeJungyo, Guidance
AsahiyamaJungyo, Guidance
HamakazeGate
KatsunouraGate
SekinotoGate, Social Contribution
TakasakiInformation, Guidance, Social Contribution, KHO
NarutoInformation (Press Club)
SHUNIN (OFFICERS)
ShiranuiRegional Basho (Osaka), Guidance, Social Contribution
TatsutagawaJungyo, Guidance
TomozunaShimpan, Guidance
NishiiwaShimpan, Guidance
IIN TAIGU TOSHIYORI (ACTING SENIOR OFFICERS)
(currently none) 
TOSHIYORI (JUNIOR OFFICERS)
TakanohanaShimpan, Guidance
NishikijimaSumo Training School, Guidance (Kimarite)
OtowayamaSumo Training School, Guidance (Kimarite), Social Contribution
OnogawaGuidance, Social Contribution
TOSHIYORI KARIKABU (JUNIOR OFFICERS - KABU ON LOAN)
KiyomigataGuidance, Social Contribution
KimigahamaGuidance, Social Contribution
SanoyamaGuidance, Social Contribution
AraisoGuidance, Social Contribution
NakamuraGuidance, Social Contribution
KasugayamaGuidance, Social Contribution
SANYO (CONSULTANTS - RE-EMPLOYED OYAKATA AT AGE 65-70)
TateyamaLifestyle Guidance
TokiwayamaLifestyle Guidance
MatsuchiyamaLifestyle Guidance
DekiyamaLifestyle Guidance (Education)
KiriyamaLifestyle Guidance
OshimaLifestyle Guidance (Education)
TakekumaLifestyle Guidance
OyamaLifestyle Guidance (Education), Guidance (Kimarite)
HYOGIIN (COUNCILLORS)
Ikenobo YasukoExternal Councillor
Ebisawa KatsujiExternal Councillor
Takino KinyaExternal Councillor
Kimura KeijiExternal Councillor
Morita Takeo (former Fujinokawa)Internal Councillor
Ishida Yoshikazu (former Washuyama)Internal Councillor
Ozuka Hajime (former Asanosho)Internal Councillor