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Ronald Harper Jr. (born April 12, 2000) is an American professional basketball player for the Boston Celtics of the National Basketball Association (NBA). He played college basketball for the Rutgers Scarlet Knights of the Big Ten Conference. He is the son of former NBA player Ron Harper and his younger brother Dylan currently plays for the San Antonio Spurs.
| Year | Team | GP | GS | MPG | FG% | 3P% | FT% | RPG | APG | SPG | BPG | |
| 2022–23 | Toronto | 9 | 0 | 5 | 500 | 333 | 1 | 8 | 4 | 0 | 1 | |
| 2023–24 | Toronto | 1 | 0 | 3 | – | – | – | 0 | 1 | 0 | 0 | |
| 2024–25 | Detroit | 1 | 0 | 17 | 125 | 000 | 1 | 7 | 2 | 0 | 0 | |
| 2025–26 | Boston | 29 | 3 | 11 | 418 | 350 | 750 | 1 | 8 | 3 | 3 | |
| Career | 40 | 3 | 9 | 410 | 326 | 857 | 1 | 7 | 3 | 3 | 3 | |
| Year | Team | GP | GS | MPG | FG% | 3P% | FT% | RPG | APG | SPG | BPG | |
| 2026 | Boston | 6 | 1 | 4 | 444 | 500 | – | 7 | 2 | 5 | 0 | |
| Career | 6 | 1 | 4 | 444 | 500 | – | 7 | 2 | 5 | 0 | 1 | |
| Year | Team | GP | GS | MPG | FG% | 3P% | FT% | RPG | APG | SPG | BPG | |
| 2018–19 | Rutgers | 31 | 19 | 22 | 413 | 278 | 679 | 3 | 1 | 6 | 5 | |
| 2019–20 | Rutgers | 31 | 31 | 28 | 452 | 349 | 708 | 5 | 1 | 8 | 8 | |
| 2020–21 | Rutgers | 27 | 27 | 32 | 441 | 310 | 736 | 5 | 1 | 7 | 6 | |
| 2021–22 | Rutgers | 32 | 32 | 34 | 442 | 398 | 795 | 5 | 1 | 1 | 6 | |
| Career | 121 | 109 | 29 | 439 | 340 | 741 | 5 | 1 | 8 | 6 | 12 | |