Moria says, "The Entity becomes an absorbing film, in large part due to Frank De Felitta’s strong script.... There is a fine performance from Barbara Hershey, who reacts to the situation with a high degree of conviction." Empire Online gives it 3 out of 5 stars and calls it "A lengthy, sometimes painful film that manages to find a few shocks left unplucked by The Exorcist, turning the special effects from the usually-tame invisibility sub-genre to it's own nefarious ends."
Time Out says it "doesn't emerge quite as one-dimensionally nasty as its synopsis suggests." Horror News says, "The Entity remains a highly entertaining bit of widescreen eighties hokum that delivers some genuine jolts, an over-earnest performance from Barbara Hershey, and a premise that’s so outrageously unbelievable it must be true!"
Bloody Good Horror closes with this: "Even at the ripe age of 29 “The Entity” has few equals in anxiety and creep factor." Rotten Tomatoes has an audience score of 60% but no critics rating.