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Belus Prajoux Nadjar (born 27 February 1955) is a retired professional tennis player from Chile.
Prajoux won six doubles titles on the ATP Tour during his career. He reached a highest doubles ranking of No. 17 in July 1982. He was a member of the Chile Davis Cup team, and played on the team that reached the final of the 1976 Davis Cup. Prajoux retired from the tour in 1986.
| 5–7, 3–6, 1–1 ret. |
| Grand Slam (0) |
| Tennis Masters Cup (0) |
| ATP Masters Series (0) |
| ATP Tour (6) |
| Win | 1. | Jul 1976 | Hilversum, Netherlands | Clay | Ricardo Cano | Wojciech Fibak Balázs Taróczy | 6–4, 6–3 |
| Loss | 1. | Nov 1976 | São Paulo,, Brazil | Carpet | Ricardo Cano | Lito Álvarez Víctor Pecci | 4–6, 6–3, 3–6 |
| Loss | 2. | Nov 1976 | Buenos Aires, Argentina | Carpet | Ricardo Cano | Carlos Kirmayr Lito Álvarez | 4–6, 5–7 |
| Loss | 3. | Dec 1976 | Chilean Open, Chile | Clay | Lito Álvarez | Patricio Cornejo Hans Gildemeister | 3–6, 6–7 |
| Win | 2. | Nov 1977 | Bogotá, Colombia | Clay | Hans Gildemeister | Jorge Andrew Carlos Kirmayr | 6–4, 6–2 |
| Win | 3. | May 1978 | Rome Masters, Italy | Clay | Víctor Pecci | Jan Kodeš Tomáš Šmíd | 6–7, 7–6, 6–1 |
| Loss | 4. | Jun 1978 | Birmingham, UK | Grass | José Luis Clerc | Dick Stockton Erik Van Dillen | 6–4, 1–6, 6–3, 6–8, 3–6 |
| Loss | 5. | Jul 1978 | Stuttgart Open, West Germany | Clay | Carlos Kirmayr | Jan Kodeš Tomáš Šmíd | 3–6, 6–7 |
| Loss | 6. | Nov 1978 | Buenos Aires, Argentina | Clay | José Luis Clerc | Chris Lewis Van Winitsky | 4–6, 6–3, 0–6 |
| Loss | 7. | Nov 1980 | Quito Open, Ecuador | Clay | José Luis Clerc | Andrés Gómez Hans Gildemeister | 3–6, 6–1, 4–6 |
| Win | 4. | Nov 1980 | Chilean Open | Clay | Ricardo Ycaza | Carlos Kirmayr João Soares | 4–6, 7–6, 6–4 |
| Win | 5. | Sep 1981 | ATP Bordeaux, France | Clay | Andrés Gómez | Jim Gurfein Anders Järryd | 7–5, 6–3 |
| Loss | 8. | Sep 1981 | Palermo, Italy | Clay | Jaime Fillol | José Luis Damiani Diego Pérez | 1–6, 4–6 |
| Loss | 9. | Nov 1981 | Chilean Open, Chile | Clay | Ricardo Cano | Hans Gildemeister Andrés Gómez | 2–6, 6–7 |
| Loss | 10. | May 1982 | French Open, France | Clay | Hans Gildemeister | Sherwood Stewart Ferdi Taygan | 5–7, 3–6. 1–1 ret. |
| Win | 6. | Feb 1983 | Viña del Mar, Chile | Clay | Hans Gildemeister | Júlio Góes Ney Keller | 6–3, 6–1 |
| Loss | 11. | Mar 1983 | Nancy, France | Clay | Ricardo Acuña | Jan Gunnarsson Anders Järryd | 5–7, 3–6 |
| Loss | 12. | Jul 1983 | Boston, United States | Clay | Hans Gildemeister | Mark Dickson Cássio Motta | 5–7, 3–6 |
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