| Gralak | |
| Full Name: | Paulo Sérgio Gralak |
| Birth Date: | 1969 9, df=yes |
| Birth Place: | Reboucas, Paraná, Brazil |
| Position: | Defender |
| Years1: | 1988–1989 |
| Clubs1: | Pinheiros |
| Years2: | 1989–1993 |
| Clubs2: | Paraná Clube |
| Years3: | 1993–1994 |
| Clubs3: | Corinthians |
| Years4: | 1994–1995 |
| Clubs4: | Coritiba |
| Years5: | 1996–1998 |
| Clubs5: | Bordeaux |
| Caps5: | 51 |
| Goals5: | 1 |
| Years6: | 1998–2001 |
| Clubs6: | İstanbulspor |
Paulo Sérgio Gralak (born 18 September 1969), known as just Gralak, is a Brazilian former professional footballer who played as a defender.