| Club: | Napoli |
| Season: | 2009–10 |
| Manager: |  Roberto Donadoniuntil 6 October 2009, then Walter Mazzarri |
| Stadium: | Stadio San Paolo |
| Mgrtitle: | Manager |
| Chairman: | Aurelio De Laurentiis |
| Chrtitle: | Chairman |
| League: | Serie A |
| League Result: | 6th |
| Cup1: | Coppa Italia |
| Cup1 Result: | Round of 16 |
| League Topscorer: | Marek Hamšík (12) |
| Season Topscorer: | Marek Hamšík (12) |
| Highest Attendance: | 56.211 vs Inter (14 February 2010) |
| Lowest Attendance: | 23.209 vs Siena (27 September 2009) |
| Average Attendance: | 40.797 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
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The 2009–10 S.S.C. Napoli season was the club's 67th season in Serie A, its third consecutive season in Serie A and its 83rd season overall.
__TOC__
| Date | Pos. | Name | From | Fee |
|---|---|---|---|---|
| 1 July 2009 | MF | Roberto De Zerbi | Avellino | End of loan |
| 1 July 2009 | DF | Erminio Rullo | Triestina | End of loan |
| 1 June 2009 | FW | Fabio Quagliarella | Udinese | €18.75 million[3] |
| 3 July 2009 | MF | Luca Cigarini | Atalanta | €12 million[4] |
| 9 July 2009 | DF |  Hugo Campagnaro | Sampdoria | €5 million and joint-ownership of Daniele Mannini[5] |
| 9 July 2009 | MF |  Juan Camilo Zúñiga | Siena | €8.5 million[6] |
| 24 July 2009 | GK | Morgan De Sanctis |  Sevilla | €1.5 million[7] [8] |
| 28 July 2009 | FW |  Erwin Hoffer | Rapid Wien | €5.5 million[9] [10] |
| 8 January 2010 | DF | Andrea Dossena | Liverpool | €4.25 million[11] |
| Date | Pos. | Name | To | Fee | |
|---|---|---|---|---|---|
| 8 June 2009 | DF | György Garics | Atalanta | Undisclosed[12] | |
| 9 July 2009 | MF | Daniele Mannini | Sampdoria | Joint-ownership bid |
| Date From | Date To | Pos. | Name | Moving To | |
|---|---|---|---|---|---|
| 15 July 2009 | 2010 | FW | Camillo Ciano | Lecco | |
| 15 July 2009 | 2010 | DF | Mario D'Urso | Lecco | |
| 15 July 2009 | 2010 | MF | Luca Giannone | Lecco | |
| 15 July 2009 | 2010 | MF | Cosmo Palumbo | Lecco | |
| 5 August 2009 | 2010 | FW | Cristian Bucchi | Cesena | |
| 7 August 2009 | 2010 | MF | Samuele Dalla Bona |  Iraklis | |
| 21 August 2009 | 2010 | FW | Marcelo Zalayeta | Bologna | |
| 21 August 2009 | 2010 | MF | Luigi Vitale | Livorno | |
| 20 August 2009 | 2010 | GK | Nicolás Navarro | River Plate | |
| 31 August 2009 | 2010 | MF | Manuele Blasi | Palermo |
See main article: 2009–10 Serie A.
Marek Hamšík – 12 Fabio Quagliarella – 11 Ezequiel Lavezzi – 8 Germán Denis – 5 Christian Maggio – 4