| Season: | 2004 |
| Dates: | 18 April-7 November |
| Competition: | A Lyga |
| Winners: | FBK Kaunas |
| Continentalcup1: | UEFA Champions League |
| Continentalcup1 Qualifiers: | FBK Kaunas |
| Continentalcup2: | UEFA Cup |
| Continentalcup2 Qualifiers: | FK Ekranas FK Atlantas |
| Continentalcup3: | UEFA Intertoto Cup |
| Continentalcup3 Qualifiers: | FK Zalgiris FK Vetra |
| Prevseason: | 2003 |
| Nextseason: | 2005 |
The Lithuanian A Lyga 2004 was the 15th season of top-tier football in Lithuania. The season started on 18 April 2004 and ended on 7 November 2004.[1] 8 teams participated with FBK Kaunas winning the championship.