| Club: | Lazio |
| Season: | 2012–13 |
| Manager: | Vladimir Petković |
| Chairman: | Claudio Lotito |
| Chrtitle: | President |
| Stadium: | Stadio Olimpico |
| League: | Serie A |
| League Result: | 7th |
| Cup1: | Coppa Italia |
| Cup1 Result: | Winners |
| Cup2: | UEFA Europa League |
| Cup2 Result: | Quarter-finals |
| League Topscorer: | Miroslav Klose (15) |
| Season Topscorer: | Miroslav Klose (16) |
| Highest Attendance: | 52,506 vs Juventus (Serie A, 29 January 2013) |
| Lowest Attendance: | 6,682 vs Siena (19 December 2012) |
| Average Attendance: | 31,992[1] |
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| Prevseason: | 2011–12 |
| Nextseason: | 2013–14 |
The 2012–13 season was the 113th season in Società Sportiva Lazio's history and their 25th consecutive season in the top-flight of Italian football.
During the pre-season, Lazio bought Ederson from Lyon,[2] Antonio Candreva from Udinese[3] and Michaël Ciani from Bordeaux.[4]
| Date | Player | Moving from | Fee | ||
|---|---|---|---|---|---|
 |  Lyon | Free | |||
 | Udinese | Loan | |||
| | Bordeaux | €4,000,000 |
| Date | Player | Moving to | Fee | ||
|---|---|---|---|---|---|
| | Salernitana | Loan | |||
 | Norwich City | Loan | |||
| | Salernitana | Loan | |||
| | Hellas Verona | Loan | |||
| | Salernitana | Loan | |||
| | Lanciano | Loan | |||
 |  Al-Wasl | Loan | |||
| | Genoa | Loan | |||
| | Internazionale | €300,000 | |||
| | Como | Loan | |||
 | Atalanta | Undisclosed |
See main article: 2012–13 Serie A.
See main article: 2012–13 Coppa Italia.
See main article: 2012–13 UEFA Europa League.
See main article: 2012–13 UEFA Europa League knockout phase.
|-! colspan="15" style="background:#dcdcdc; text-align:center"| Goalkeepers|-! colspan="15" style="background:#dcdcdc; text-align:center"| Defenders|-! colspan="15" style="background:#dcdcdc; text-align:center"| Midfielders|-! colspan="15" style="background:#dcdcdc; text-align:center"| Forwards|-! colspan="15" style="background:#dcdcdc; text-align:center"| Players transferred out during the season
| Rank | Name | League | Coppa Italia | Europe | Total | |
|---|---|---|---|---|---|---|
| 1 | Miroslav Klose | 15 | 0 | 1 | 16 | |
| 2 | Hernanes | 11 | 2 | 1 | 14 | |
| 3 |  Libor Kozák | 0 | 0 | 10 | 10 | |
| 4 | Sergio Floccari | 5 | 1 | 4 | 10 | |
| 5 | Antonio Candreva | 5 | 0 | 1 | 6 | |
| 6 | Stefano Mauri | 3 | 1 | 0 | 4 | |
| 7 |  Ștefan Radu | 1 | 1 | 1 | 3 | |
| Álvaro González | 1 | 1 | 1 | 3 | ||
| Ederson | 1 | 0 | 2 | 3 | ||
 Senad Lulić | 1 | 1 | 1 | 3 | ||
| 11 |  Ogenyi Onazi | 1 | 0 | 1 | 2 | |
| 12 | Abdoulay Konko | 1 | 0 | 0 | 1 | |
| Giuseppe Biava | 1 | 0 | 0 | 1 | ||
| Cristian Ledesma | 1 | 0 | 0 | 1 | ||
| Michaël Ciani | 0 | 1 | 0 | 1 | ||
| Mauro Zárate | 0 | 0 | 1 | 1 | ||
| Own Goals | 3 | 0 | 1 | 4 | ||
| Total | 49 | 8 | 25 | 82 | ||