| Daysy Bareiro | |
| Fullname: | Daysy María Jesús Bareiro Martínez |
| Birth Date: | 2001 1, df=yes |
| Birth Place: | Asunción, Paraguay |
| Height: | 1.54 m [1] |
| Position: | Defender |
| Currentclub: | Juan Grande |
| Clubnumber: | 18 |
| Years1: | –2018 |
| Clubs1: | Cerro Porteño |
| Years2: | 2019–2020 |
| Clubs2: | Sol de América |
| Years3: | 2020– |
| Clubs3: | Juan Grande |
| Caps3: | 43 |
| Goals3: | 2 |
| Nationalyears1: | 2016 |
| Nationalteam1: | Paraguay U17 |
| Nationalcaps1: | 3 |
| Nationalgoals1: | 0 |
| Nationalyears2: | 2018 |
| Nationalteam2: | Paraguay U20 |
| Nationalcaps2: | 1 |
| Nationalgoals2: | 0 |
| Nationalyears3: | 2019– |
| Nationalteam3: | Paraguay |
| Nationalcaps3: | 1 |
| Nationalgoals3: | 0 |
| Pcupdate: | 28 May 2022 |
| Ntupdate: | 3 August 2019 |
Daysy María Jesús Bareiro Martínez (born 19 January 2001) is a Paraguayan footballer who plays as a defender for Spanish Primera Federación club CD Juan Grande and the Paraguay women's national team. She has also played for the Paraguay women's U20 and U17 teams.