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若且唯若(粵拼:joek6 ce2 wai4 joek6)係邏輯學上嘅一個重要概念,喺數學證明上都成日會用到。如果話「A 係真確,若且唯若 B 係真確」,意思即係話[1]
所以 B 係 A 嘅充分條件(1),亦係 A 嘅必要條件(2)。
若且唯若嘅英文嗌法係 if and only if(iff)。