| Ádám Decker | |
| Nationality: | Hungarian |
| Birth Date: | 29 February 1984 |
| Birth Place: | Budapest, Hungary |
| Height: | 203 cm |
| L/R: | Right |
| Youthyears1: | 1992– |
| Youthclubs1: | BVSC |
| Years1: | –2004 |
| Clubs1: | BVSC |
| Years2: | 2004–2009 |
| Clubs2: | Eger |
| Years3: | 2009–2012 |
| Clubs3: | Vasas |
| Years4: | 2012–2014 |
| Clubs4: | Szeged |
| Years5: | 2014–2016 |
| Clubs5: | OSC-Újbuda |
| Years6: | 2016–2020 |
| Clubs6: | Eger |
| Years7: | 2020–2022 |
| Clubs7: | Bp. Honvéd |
| Nationalyears1: | 2012–2017 |
| Nationalteam1: | Hungary |
| Nationalcaps1: | 101 |
| Show-Medals: | no |
| Updated: | 2 August 2023 |
Ádám Decker (born 29 February 1984) is a Hungarian male water polo player. He is part of the Hungary men's national water polo team. He won a gold medal at the 2013 World Championships.[1] He is the older brother of Attila Decker water polo player.