卡西维拉努斯（英语：Cassivellaunus）是在公元前54年带领守军抵御凯撒入侵的不列吞凯尔特人酋长。他领导了反对罗马势力的部落联盟，但最后他遭那些被凯撒打败的部落出卖而投降。

Cassivellaunus was a historical British tribal chief who led the defence against Julius Caesar's second expedition to Britain in 54 BC. He led an alliance of tribes against Roman forces, but eventually surrendered after his location was revealed to Julius Caesar by defeated Britons.