Kokushu was one of social statuses of daimyo (feudal lords) which existed during the early modern Edo period, and it referred to the daimyo having domain of one or more provinces; another name for kokushu was "kunimochidaimyo".
江戸幕藩体制における国主（こくしゅ）は、近世江戸時代の大名の格式のひとつで、領地が一国以上である大名を言い、国持大名とも言う。