熱力學 (Jia̍t-le̍k-ha̍k)平衡 (pêng-hêng) (熱力學平衡; thermodynamic equilibrium)，簡稱 (kán-chheng)熱平衡 (jia̍t-pêng-hêng) (熱平衡)，是 (sī)一 (chi̍t)个 (ê)熱力學系統 (hē-thóng)佇 (tī)無 (bô)外界 (gōa-kài)影響 (éng-hióng)的 (ê)條件 (tiâu-kiāⁿ)之下 (chi-hā)，系統的宏觀 (hông-koan)物理量 (bu̍t-lí-liōng)攏 (lóng)真 (chin)齊勻 (chiâu-ûn)的狀況 (chōng-hóng)。