Harmony Chapter No. 3 was founded in Belgrade in October 2013 as Harmony Chapter No. 66 under protection of the Prince Hall Grand Chapter of Royal Arch Masons of the State of South Carolina. After one year of work under dispensation, and receiving Charter in 2014, Harmony  became one of three founding Chapters of the Grand Chapter of Royal Arch Masons of Serbia, with the number Three on the list of subordionate Chapters.

Harmony No. 3 meets every third Wednesday in the Month from September to June at the UGLS Temple in Belgrade at 7:00PM.