三結義，又稱三兄弟、三相刻，日本稱三色同刻是麻雀中的一種食糊形式，當手牌中含有三種數牌（萬、筒、索）的相同大小的刻子或槓子（不論明刻、明槓、暗刻、暗槓皆可）時成立。日本麻雀為2翻，廣東麻雀為5或7番，國標麻雀為16分為是相當少見的役種，出現概率比清一色低。
例子
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