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.

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Czechoslovak Genealogical Society International (CGSI) is a member-based organization.

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.

CGSI conference attendees at a table

What Members Say

Because of CGSI, in six months I went from knowing nothing about my Czech ancestors to learning I had relatives who were serfs on the Litomyšl estate.
JoAnn P., Cadott, Wisconsin, USA

News & Events

Three Giants of Czech and Slovak Architecture: Architects who made a difference beyond their homelands Saturday, January 30th, 2021 - 10 am - 12:45 pm CDT…
MGC is now reopened to all members and visitors, with limited hours, on Thursdays from 4pm to 8pm and Saturdays from 10am to 4pm (CST).
CGSI Bylaw Amendment proposed for Annual Membership Meeting on October 24, 2020.

"The New Ethnicity Estimates (DNA)" (Webinar)

The new Ethnicity Estimate introduces a whole new level of detail to MyHeritage's DNA tests. Learn more about it in this webinar.

CGSI Quarterly Program "Three Giants of Czech and Slovak Architecture" (Webinar)

Join online for CGSI's look at notable architects from the Czech and Slovak lands around the world and the impact they made in late 19th and early 20th centuries.

Genealogy ConferenceKeeper.org (online event calendar)

Genealogy ConferenceKeeper.org is the most complete, entirely free, online calendar of genealogy conferences & events. Check it out often for events of genealogical interest.
Christmas Old Town Square Prague night