Family name Sedlacek (Sedlacek 
, Седлачек 
) , in the entire world, is a common cognomen. The cognomen Sedlacek is characteristic of Czechia, where it is quite a common surname, Slovakia, and Austria, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Czechia, the United States, and Slovakia.
| wilhelm ludwig sedlacek (1793-1853), CZ (b. 1793) |
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| joseph sedlacek AT (b. 1789) |
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| ernestus sedlacek AT (b. 1796) |
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franz sedlacek Austrian artist (1891-1945), PL (b. 1891) |
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| franz sedlacek Austrian association football player (1850-), AT (b. 1850) |
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| vladimir sedlacek Czech architect and builder (b. 1872) |
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| stephan sedlacek AT (b. 1868) |
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| robert sedlacek Austrian illustrator (1881-1957), AT (b. 1881) |
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| franz sedlacek Austrian association football manager and association football player (1893-1949), AT (b. 1893) |
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robert sedlacek Austrian football referee, AT (b. 1955) |
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norbert sedlacek Austrian navigator, AT (b. 1962) |
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| woodrow sedlacek American horse trainer (1919-2004), US (b. 1919) |
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jorge mário sedlacek Brazilian politician, BR |
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| gerhard sedlacek DE (b. 1939) |
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| milos sedlacek CZ (b. 1941) |
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