二茂锰是一种金属有机化合物，属于茂金属。这种棕色固体在高于158 °C时有着不同寻常的磁性。

和其他茂金属一样，二茂锰可以由氯化锰和环戊二烯基化合物（通常是环戊二烯基钠）反应来制备。为此，必须首先让环戊二烯与钠反应以去质子。

通过环戊二烯基钠和氯化锰在四氢呋喃、乙二醇二甲醚和液氨等溶剂中进行的反应生成了二茂锰。

Manganocene or bis(cyclopentadienyl)manganese(II) is an organomanganese compound with the formula [Mn(C₅H₅)₂]_n. It is a thermochromic solid that degrades rapidly in air. Although the compound is of little utility, it is often discussed as a example of a metallocene with ionic character.