丙炔，又称甲基乙炔，是一种炔烃，其结构简式为CH₃C≡CH。它是MAPP气体（风焊气体）的其中一种成分。

丙炔与丙二烯平衡地存在于室温中，丙炔与丙二烯的混合物被称为MAPD：

CH≡CCH₃ ⇌ H₂C=C=CH₂；K_eq = 0.22 (270 °C), 0.1 K (5 °C)

MAPD是丙烷催化裂解成丙烯的反应中的副产物。丙炔也能干扰丙烯的催化聚合过程。

Propyne (methylacetylene) is an alkyne with the chemical formula CH₃C≡CH. It was a component of MAPP gas—along with its isomer propadiene (allene), which was commonly used in gas welding. Unlike acetylene, propyne can be safely condensed.