Luggage storage

The Eurostar terminates in Paris at the train station Gare du Nord.

Gare du Nord has lockers:
https://parisbytrain.com/gare-du-nord-baggage-luggage-storage/

The Paris station is Gare du Nord.
They have luggage lockers of various sizes.
The station website will explain it all (in English).

Edit: Jazz posted while I was writing. His link has you covered!

Thanks much!