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)


The 2023 CGSI 19th Genealogical/Cultural Conference will be held October 17–21, 2023, at The Ingleside Hotel located outside of Milwaukee, Wisconsin.

A CGSI conference is a great place to learn, share, and connect with the genealogy, history, and culture of those from the Czech and Slovak ancestral lands of Central Europe.

 2023 CGSI Conference Registration Booklet cover

The format allows you to connect with information, resources, and other attendees via

  • presentations
  • networking opportunities
  • social events
  • tours
  • workshops

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

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…

Slavic Fest 2023 (festival)

St. Mary's Holy Dormition Orthodox Church in Calhan, Colorado presents its Slavic Fest 2023. Don't miss this festival with all the delicious recipes and traditions handed down from their Slovak pioneers and founders!

CGSI 19th Genealogical/Cultural Conference – Milwaukee (conference)

Mark your calendar now for CGSI's 19th Genealogical/Cultural Conference at The Ingleside Hotel in Pewaukee, Wisconsin from October 17–21, 2023.

UPitt's 33rd Annual Slovak Heritage Festival 2023 (festival)

The Slovak Studies Program at the University of Pittsburgh hosts their annual Slovak Heritage Festival on-campus.