并五苯（Pentacene）是一种五个苯环由直线状稠合组成的一种多环芳香烃，化学式C₂₂H₁₄。并五苯对光和氧气敏感，市售并五苯常因氧化而表面带绿色。并五苯是一种有机半导体。

最初的使用合成路线在1961年提出，由邻苯二甲醛与1,4-环己二酮通过羟醛缩合得并五苯醌，再由铝汞齐还原得并五苯。

另一种合成法首先得到一个羰基桥环的前体化合物，再于150℃，或经光照失1分子CO，得并五苯。该前体化合物溶于氯仿，而并五苯不溶于一般有机溶剂，因此该法适用于以旋转涂覆制得并五苯薄膜。并五苯溶于热的氯代苯，可用1,2,4-三氯苯作溶剂重结晶。

Pentacene is a polycyclic aromatic hydrocarbon consisting of five linearly-fused benzene rings. This highly conjugated compound is an organic semiconductor. The compound generates excitons upon absorption of ultra-violet (UV) or visible light; this makes it very sensitive to oxidation. For this reason, this compound, which is a purple powder, slowly degrades upon exposure to air and light.