Ka'idar Dangantakar Einstein tana nufin ka'idodin kimiyyar lissafi guda biyu masu alaƙa da Albert Einstein ya ƙirƙira a farkon ƙarni na 20. Na farko ita ce ka’idar Dangantaka ta Musamman, wacce aka buga a shekarar 1905, wacce ta yi bayani kan alakar sararin samaniya da lokaci, na biyu kuma ita ce “General Theory of Relativity” da aka buga a shekarar 1915, wadda ta yi bayani kan alakar da ke tsakanin sarari, lokaci, da nauyi. Ka'idar Dangantaka ta Musamman ta ba da shawarar cewa ka'idodin kimiyyar lissafi iri ɗaya ne ga duk masu kallo a cikin motsi iri ɗaya dangane da juna, kuma cewa saurin haske yana dawwama kuma ba tare da motsin mai kallo ba ko kuma tushen haske. Wannan ka'idar kuma ta gabatar da manufar fadada lokaci, inda lokaci ya bayyana yana wucewa sannu a hankali don abubuwan da ke motsawa cikin sauri. curvature na sararin samaniya wanda ya haifar da kasancewar taro da makamashi. Wannan ka'idar kuma ta yi hasashen samuwar black holes da raƙuman ruwa na gravitational.