Chlodio (probably died after 450), also Clodio, Clodius, Clodion, Cloio or Chlogio, was a Frankish king who attacked and then apparently ruled Roman-inhabited lands around Cambrai and Tournai, near the modern border of Belgium and France.

The Chronicle of Fredegar, on the other hand, makes Chlodio a son of Theudemeres, another real Frankish king who Gregory of Tours reported to have been executed with his mother by the Romans.

One translation of what Gregory wrote, adding some Latin key words in square brackets, is as follows: This description of locations does not match the normal medieval and modern "Thuringia", which is far inland and east of the Rhine and distant from all known Frankish areas.

[5] The latter two proposals would fit the geography well, because they are within striking distance of the Silva Carbonaria, west of the Rhine, and close to Toxandria, which is known to have been settled by the Salians in the time of Julian the Apostate.

According to this account, Chlodio held power in the northernmost part of still-Romanized Northern Gaul, together with an area further northeast apparently already Frankish.

The passage describes "Cloio" as having overrun the land of the Atrebates (Artois, a province north of the Somme, and partly between Tournai and Cambrai).

According to Gregory's understanding, the original Franks living west of the Rhine had different kings in each Roman district (pagus or civitas), but they were all part of one specific noble family, which had included Chlodio.

A contemporary Roman historian, Priscus writes of having witnessed in Rome, a "lad without down on his cheeks as yet and with fair hair so long that it poured down his shoulders, Aetius had made him his adopted son".