About Us


Learn. Share. Connect.

Czechoslovak Genealogical Society International (CGSI) is the leader in providing educational, cultural, historical, and genealogical resources, with a special emphasis in providing opportunities for our members to research and discover their heritage.

CGSI Logo Blue & Red Map Outline


Research and connect with families from the Czech and Slovak ancestral lands. CGSI focuses on the areas of the present-day Czech Republic and Slovakia. This includes Czech (Bohemian), German-Bohemian (Böhmisch), Hungarian, Jewish, Moravian, Rusyn (Ruthenian), Silesian, and Slovak ancestry.



CGSI is a proud member of:

Czechoslovak Genealogical Society International (CGSI) is a 501(c)(3) non-profit organization (EIN: 41-1693018) under the United States Internal Revenue Code which allows United States taxpayers to receive tax deductions for contributions to the extent allowed by the Internal Revenue Service (IRS).