The following centres in Beirut provide courses in Arabic for foreigners:
American Language Center Offers three levels of colloquial Arabic courses (beginners, intermediate and advanced).
American University of Beirut The AUB's Center for Arab and Middle Eastern Studies (CAMES) offers a seven-week intensive summer programme in Modern Standard Arabic.
The following centre is located in Tripoli. Check current travel warnings before considering it:
Levantine Institute This is a great opportunity to learn Arabic (either classical or vernacular Lebanese) as well as help out by teaching disadvantaged Syrian refugee children, who struggle with the trilingual school system here as they lack previous exposure to English and French.