A cikin algebra, alkubra na Okubo ko algebra na algebra algebra ne mai girma 8 ba tare da haɗin gwiwa ba kamar wanda Susumu Okubo yayi nazari. Okubo algebras sune algebras abun da ke ciki, algebras masu sassauƙa ( A ( BA )) = ( AB ) A ), Ƙarya algebras da ake yarda da su, da haɗin gwiwa na iko, amma ba ma'amala bane, ba madadin algebras ba, kuma ba su da ƙimar ainihi. Misalin Okubo shine algebra na 3-by-3 trace -zero matrices hadaddun, tare da samfurin X da Y da aka bayar ta aXY + bYX - Tr ( XY ) I /3 inda nake matrix na ainihi kuma a da b gamsar da a + b = 3 ab = 1. A Hermitian abubuwa samar da wani 8-girma real ba associative division aljabara . Irin wannan ginin yana aiki ga kowane alubabbar madaidaiciyar madaidaiciya akan filin da ke ɗauke da tushen haɗin kai na asali. Alkubra na Okubo algebra ne da aka gina ta wannan hanyar daga abubuwan da aka gano-sifili na algebra mai sauƙi -3 na tsakiya akan filin.