Open Steam or Battle.net right now and switch your language settings to English. See you in the lobbies.
If the game remains in another language, try these configuration fixes: call of duty modern warfare 3 english language pack better
: English assets are typically the first to be finalized and updated, ensuring that you aren't waiting for localized audio patches during a new season launch. How to Get the English Language Pack Open Steam or Battle
: Experience the campaign and operator banter with the original voice actors' performances. Fixes region issues call of duty modern warfare 3 english language pack better