| Club: | LDU Quito |
| Season: | 2003 |
| Chairman: | Darío Ávila |
| Chrtitle: | President |
| Manager: | Jorge Fossati |
| Mgrtitle: | Manager |
| Stadium: | Estadio Casa Blanca |
| League: | Serie A |
| League Result: | Champions (7th title) |
| Cup1: | Copa Sudamericana |
| Cup1 Result: | Second Stage |
| League Topscorer: | Virgilio Ferreira (11 goals) |
| Season Topscorer: | Virgilio Ferreira (12 goals) |
| Pattern B1: | _LDU 2003 |
| Pattern La2: | _LDU 2003A |
| Pattern B2: | _LDU 2003A |
| Pattern Ra2: | _LDU 2003A |
| Shorts2: | FF7028 |
| Socks2: | FF7028 |
| Pattern La3: | _LDU 2003CS |
| Pattern B3: | _LDU 2003CS |
| Pattern Ra3: | _LDU 2003CS |
| Shorts3: | 000000 |
| Socks3: | 000000 |
| Prevseason: | 2002 |
| Nextseason: | 2004 |
Liga Deportiva Universitaria de Quito's 2003 season was the club's 73rd year of existence, the 50th year in professional football, and the 42nd in the top level of professional football in Ecuador.
Supplier: Umbro
Sponsor(s): Siemens Mobile, Coca-Cola, Almacenes Japón
See main article: article and 2003 Copa Sudamericana.