Czechoslovak may refer to:
- A demonym or adjective pertaining to Czechoslovakia (1918–93)
- First Czechoslovak Republic (1918–38)
- Second Czechoslovak Republic (1938–39)
- Third Czechoslovak Republic (1948–60)
- Fourth Czechoslovak Republic (1960–89)
- Fifth Czechoslovak Republic (1989–93)
- Czechoslovak, also Czecho-Slovak, any grouping of the Czech and Slovak ethnicities:
- As a national identity, see Czechoslovakism
- The title of Symphony no. 8 in G Major op. 88 by Antonín Dvořák in 1889/90
- The Czech–Slovak languages, a West Slavic dialect continuum
- The Czechoslovak language, a theoretical standardized form defined as the state language of Czechoslovakia in its Constitution of 1920
- Comparison of Czech and Slovak