Haɗin haɗakar makaman nukiliya yana nufin wani tsari wanda atom nuclei ya haɗu don samar da tsakiya mai nauyi, yana fitar da adadi mai yawa na makamashi a cikin tsari. Wannan tsari yana faruwa ne a cikin yanayi na matsanancin zafi da matsi, kamar waɗanda ake samu a cikin tsakiyar rana, inda atom ɗin hydrogen ke haɗuwa don samar da helium. Ƙarfin da aka fitar daga halayen haɗin gwiwar nukiliya yana da yuwuwar samar da tushen makamashi mai tsabta marar iyaka.