| Season: | 2002–03 |
| Mgrtitle: | Manager |
| Owntitle: | Owner |
| Chairman: | Sergio Cragnotti Ugo Longo |
| Chrtitle: | President |
| League Result: | 4th (in UEFA Champions League) |
| League Topscorer: | Claudio López (15) |
| Season Topscorer: | Claudio López (17) |
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The 2002–03 season was the 103rd season in Società Sportiva Lazio's history and their 15th consecutive season in the top-flight of Italian football. Under new manager Roberto Mancini, Lazio finished 4th in Serie A and reached the semi-finals of both the Coppa Italia and the UEFA Cup.
Owing to financial worries club President Sergio Cragnotti sold out several players including club legend defender Alessandro Nesta to A.C. Milan, forward Hernan Crespo to Inter and Gaizka Mendieta was loaned out to FC Barcelona. Also, the new arrivals were young coach Roberto Mancini along low-profile players such as Bernardo Corradi from Chievo Verona and Enrico Chiesa. On 3 January 2003 a majority of club shareholders appointed Ugo Longo as its new president finishing Cragnotti 10-yr-term.
| In | |||||||
|---|---|---|---|---|---|---|---|
| width=3% | Pos. | width=32% | Name | width=30% | from | width=35% | Type |
| FW | €10.00 million | ||||||
| DF | €1.50 million | ||||||
| FW | free | ||||||
| DF | loan | ||||||
| MF | co-ownership | ||||||
| MF | loan ended | ||||||
| DF | L'Aquila | loan ended | |||||
| DF | loan ended | ||||||
| Out | |||||||
|---|---|---|---|---|---|---|---|
| width=3% | Pos. | width=32% | Name | width=30% | To | width=35% | Type |
| FW | (€40 million) | ||||||
| DF | (€31 million) | ||||||
| DF | |||||||
| DF | Teramo | ||||||
| MF | |||||||
| MF | |||||||
| DF | co-ownership | ||||||
| MF | loan | ||||||
| MF | loan | ||||||
| FW | loan | ||||||
| In | |||||||
|---|---|---|---|---|---|---|---|
| width=3% | Pos. | width=32% | Name | width=30% | from | width=35% | Type |
| MF | |||||||
| Out | |||||||
|---|---|---|---|---|---|---|---|
| width=3% | Pos. | width=32% | Name | width=30% | To | width=35% | Type |
| DF | loan | ||||||
| MF | loan | ||||||
See main article: 2002–03 Serie A.
See main article: 2002–03 Coppa Italia.
See main article: 2002–03 UEFA Cup.