二茂铬是一种有机金属化合物，化学式(C₅H₅)₂Cr。遇空气迅速氧化，有时会自燃。溶于液氨、四氢呋喃等。可由二氯化铬与环戊二烯基钠在四氢呋喃中反应制得:

CrCl₂ + 2 NaC₅H₅ → Cr(C₅H₅)₂ + 2 NaCl

二茂铬可以用作乙烯聚合高效催化剂、氢化催化剂和硫化促进剂等。

Chromocene, formally known as bis(η-cyclopentadienyl)chromium(II), is a chemical compound with the condensed structural formula [Cr(C₅H₅)₂]. Each molecule contains an atom of chromium bound between two planar systems of five carbon atoms known as cyclopentadienyl (Cp) rings in a sandwich arrangement, which is the reason its formula is often abbreviated as Cp₂Cr. It is an organometallic compound as it has (haptic) covalent chromium–carbon bonds. Chromocene is structurally similar to ferrocene, the prototype for the metallocene class of compounds; however, as it has only 16 valence electrons, it does not follow the 18-electron rule. It is a paramagnetic compound and also highly reducing, both consequences of its low valence electron count. Like structurally related metallocenes, chromocene readily sublimes in a vacuum and is soluble in non-polar organic solvents.