多元之爱（希腊语：πολύ、英语：Polyamory），又称多角忠诚、多重(伴侣)关系，指关系中人数大于「两人一对一」且参与者皆「知情同意」的恋爱、交往、伴侣等关系，例如一人同时与两人或以上交往，在此亲密关系中彼此「知道」并「同意」与其他交往者的交往关系存在。有时广义指称所有非「一夫一妻制」的各类型亲密关系，如一夫多妻、一妻多夫、群婚等。(参见多配偶制(polygamy)。但注意在历史上或不同社会习俗中，有些多配偶关系并非所有人知情同意的状况，而狭义的Polyamory实践者大多追求知情同意的价值。)

Polyamory (from Greek πολύ poly, "many, several", and Latin amor, "love") is the practice of, or desire for, intimate relationships involving more than two people, with the knowledge and consent of everyone involved. It has been described as "consensual, ethical, and responsible non-monogamy". The term should not be confused with polysexuality (attraction towards multiple genders or sexes), although the two may overlap in individuals.