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
In a short time my membership in CGSI has paid off big time.
Ron B., Garland, Texas, USA

News & Events

CGSI 2022 Annual Membership Meeting & Election of Officers (online event)
Please join CGSI at 10 AM Central on Saturday, May 21, 2022 for "Our Ukrainian Cousins: Understanding Cultural & Historical Ties  Across…
Recordings of two presentations given as part of the "The Roots of Medicine" CGSI webinar on February 26, 2022 are now available for on-demand viewing by members.

17th Annual Czech Masopust 2023 (festival)

Calmar, Iowa - Czech Mardi Gras held Annually the Saturday before Ash Wednesday. Doors Open at 12 Noon and the Program Starts at 1 PM! Dinner at 5:30PM. Event will be held at PIVO Brewery - 101 Huber Drive.

Masopust in Montgomery

Celebrate Mardi Gras Czech-style in Montgomery, Minnesota, on Sunday, February 19, 2023. We return to the Revival on Main, located in the heart of the Historic Downtown district, 213 – 1 st Street South. Don’t miss out on all the fun!…

RootsTech Connect 2023 (conference & online event)

RootsTech Connect 2023 conference will be held both in-person in Salt Lake City, Utah and online virtually.