| 2002–03 LEN Cup Winners' Cup | |
| League: | Cup Winners' Cup |
| Sport: | Water Polo |
| Duration: | 8 November 2002 to 30 March 2003 |
| No Of Teams: | 8 (quarter-finals) 15 (Total) |
| Finals Champ: |  Posillipo (2nd title) |
| Seasonslist: | LEN Cup Winners' Cup |
| Seasonslistnames: | Cup Winners' Cup |
| Prevseason Link: | 2001–02 LEN Cup Winners' Cup |
| Prevseason Year: | 2001–02 |
The 2002–03 LEN Cup Winners' Cup is the ongoing 29th edition of LEN's second-tier competition for men's water polo clubs.
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