Oin dar din (rasm, odat; qoidavu qonun), parastishi dinii ashyo, mavchudoti reali yo fantastiki, ki doroi khususiyathoi favquttabiist. Dar manoi vaseash — shakli tarikhan ba vuchud omadan munosibathoi dini. Unsurhoi tarkibii Oin amaliyoti diniyu sohiri (marosimho, ibodat) va ashyoe, ki ba on taalluq dorand (tasviroti muqaddas, ibodatkhona, mabad va gayra) meboshand.
Dar manoi mahdud Oin gufta tanho on munosibathoi diniero mefahmand, ki bo etiqod ba mavchudoti favquttabii vobastaand. Ba shaklhoi tarikhii din tarzi makhsusi parastish (oin) khos ast: Oini totemi, marosimi dafn, kosibi, avlodiyu oilavi, shamani va gayra. Navhoi Oinro vobasta ba obekthoi on chudo kardan mumkin ast: parastishi oftob, osmon, ob, hayvonot, nabotot, otash, achdod, shoh va gayra.
Baroi shaklhoi ibtidoii Oin aloqai bevosita bo doirahoi muayyani hayoti jamiyat khos bud. Oinii dinhoi muosir bo asotir omekhtaast. Namoz, ibodati salibu uqnum, sohiri va gayra unsurhoi Oin meboshand.