Vítáme Vás! (We welcome you!)

Research and connect with families from the Czech and Slovak ancestral lands.

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

CGSI has over 2,000 members residing in the United States, Canada, Czech Republic, Slovakia, and other countries, providing a vast networking opportunity to learn and share information, and connect with fellow members.

Czechoslovak Genealogical Society International (CGSI) wants to help you research and connect with your family history.

We are dedicated to genealogical research and interest in descendants of ethnic groups with roots from the Czech and Slovak ancestral lands of Central Europe.

Czech and Slovak Republic (Outlines with Maps)

What Members Say

Brno, Moravia
I credit CGSI for being able to access and decipher the records of my ancestors, as I found such helpful articles in your archives after joining - I will be forever grateful to your organization for that!
Jody D., Kennebunk, Maine, USA

News & Events

Join CGSI at the National Czech & Slovak Museum & Library for the CGSI Symposium on April 21, 2024. Full schedule and registration link…
Are you interested in learning more about Czech citizenship? On December 5th, 2023, Deputy Consul General Ondrej Pometlo discussed the history, laws, and examples of Czech citizenship. You can watch a recording of the presentation below…

CGSI Czech & Slovak Research Discussion Group (online event)

The next CGSI Czech & Slovak Research Discussion Group meets (virtually) online to share resources and discoveries among members. Moderated by CGSI Education Chair Iveta Blahútová. Please join us!

OGS 2025 Conference - Call For Papers

Ohio Genealogical Society (OGS) announces a request for lecture proposals for the 2025 Conference “Light Up Your Genealogy” to be held April 30-May 3, 2025, at Kalahari Resort & Conference Center in Sandusky, Ohio.