Kosh Naranek is a character within the fictional universe of the science fiction television series Babylon 5. The voice for the character was provided by Ardwight Chamberlain, and he was physically played by producer Jeffrey Willerth.
Kosh Naranek was the Vorlon ambassador to Babylon 5 from 2257 until his death. Babylon 5's producer and creator, J. Michael Straczynski, has noted that Naranek is a title, not part of a name.
Depicted as one of the older members of his species, Kosh Naranek was well regarded by the Vorlon Empire. The plot of the series pilot entailed Kosh's arrival, humanity's first contact with a Vorlon, and an attempt on his life by a member of the Wind Swords, a militant section of the Minbari warrior caste. Disguising himself as station Commander Jeffrey Sinclair, the would-be assassin poisoned Kosh. The Vorlon government prohibited opening Kosh's encounter suit. The Vorlon Government seemed to assume he would die, and demanded that both his body be returned and Commander Sinclair be sent to the Vorlon Homeworld for trial.