| Oskar Czertowicz | |
| Birth Date: | 9 February 2006 |
| Birth Place: | Kwidzyn, Poland |
| Nationality: | Polish |
| Height: | [1] |
| Position: | Centre back |
| Currentclub: | SG Flensburg-Handewitt |
| Clubnumber: | 19 |
| Youthyears1: | 2011–2021 |
| Youthclubs1: | HG Saarlouis |
| Youthyears2: | 2021–2023 |
| Youthclubs2: | SG Flensburg-Handewitt |
| Years1: | 2023– |
| Clubs1: | SG Flensburg-Handewitt |
Oskar Czertowicz (born 9 February 2006) is a Polish handball player for SG Flensburg-Handewitt. Born in Poland, he moved with his family to Germany aged 4 when his father Lukasz signed a contract with Wilhelmshavener HV.[2]
Czertowicz joined the youth team of Flensburg in 2021, displaying strong goalscoring abilities [3] and made his debut for the senior team against Rhein-Neckar Löwen. During the 2023–24 season, he made more regular appearances, even scoring 5 goals in a EHF European League match against Kadetten Schaffhausen.[4] He earned his first professional contract in December 2023.[5]