Garga Samhita is written by sage Garga.
Is there any English translation for Garga Samhita available online?
Yes, the Sanskrit verse, word-to-word English translation with meaning by Iskcon Vedic Media Library ebook is available to get at Radha.name - 6.7 MB (1970 pages) pdf .The official site of Iskcon Vedic Media Library was iskconmedia.com but it seems no longer hosted by team. you can take a look at snap-shot.
The book contains following Khandas: