卡拜（Carbyne）是拥有三个自由电子的电中性单价碳活性中间体HC及其衍生物（如EtO₂C-C）的统称。卡拜可通过很多方法获得。它可以短寿命的活性中间体存在于气相中。

卡拜可以与金属离子结合形成金属卡拜配合物 （如[WBr(CO)₂(2,2'-bipy)C-Ar]和[WBr(CO)₂(PPh₃)₂C-NR2]）。这类化合物的一种合成方法是让W(CO)₆与二异丙基氨基锂（LDA）反应产生[(Pr₂N)(OLi)C=W(CO)₅]，然后再让其与草酰溴或Br₂-PPh₃和三苯基膦反应。另一种合成方法是用路易斯酸处理甲氧基金属卡宾配合物。

In organic chemistry, a carbyne is a general term for any compound whose molecular structure includes an electrically neutral carbon atom with three non-bonded electrons, connected to another atom by a single bond. A carbyne has the general formula R-C, where R is any monovalent group and the superscript indicates the three unbounded valences. Carbynes are named after the simplest such compound, HC, the methylidyne radical or (unsubstituted) carbyne. Bulk carbyne (−C≡C−)_n is also called linear acetylenic carbon.