OU stands for Organizational Unit. It's used in directories in general and in LDAP (Lightweight Directory Access Protocol), particularly to point out the main attribute of the organizationalUnit class.
Organizational Unit is described in ITU-T X521 (Telecommunication Standardization sector of International Telecommunication Union) as a class used to define entries representing subdivisions of organizations. As far as LDAP is concerned, organizationalUnit
is defined in RFC2256.
Organizational Units are generaly the immediate superior of entries of object class user
, inetOrgPerson
, group
or groupOfNames
.