| Antonín Mlejnský | |
| Birth Date: | 1973 5, df=yes |
| Birth Place: | Prague, Czechoslovakia |
| Position: | Defender |
| Youthclubs1: | TJ Davle |
| Youthclubs2: | Okula Nýrsko |
| Youthyears1: | 1980–1991 |
| Youthyears2: | 1991–1993 |
| Clubs1: | DIOSS Chomutov |
| Clubs2: | SC Horní Počernice |
| Clubs3: | Viktoria Žižkov |
| Clubs4: | AC Sparta Prague |
| Clubs5: | Viktoria Žižkov |
| Years1: | 1993–1994 |
| Years2: | 1994 |
| Years3: | 1995–1998 |
| Years4: | 1998–1999 |
| Years5: | 1999–2005 |
| Caps3: | 88 |
| Caps4: | 18 |
| Caps5: | 123 |
| Goals3: | 2 |
| Goals4: | 1 |
| Goals5: | 1 |
| Nationalyears1: | 2002 |
| Nationalteam1: | Czech Republic |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
Antonín Mlejnský (born 17 May 1973, in Czechoslovakia) is a Czech former football player. He made one international appearance for the Czech Republic national football team and won the 1998–99 Gambrinus liga with AC Sparta Prague.[1]