| ksiezyc.pl | Łódź |
| KSM Vision | |
| Kuando | |
| KUD.pl | Lesser Poland |
| Kwant S.C. | Świętokrzyskie |
| Kylos Sp. z o.o. | Łódź |
| L2BEAT | |
| Lab1 | |
| Labelcall Sp. z o.o. | |
| Laboratory of Bioinformatics and Protein Engineering | Masovian |
| LaboSoft | Lesser Poland |
| Labplus S.A. | |
| Labplus S.A. | |
| LabSQL | Lublin |
| Labster | Lesser Poland |
| Labyrinth Security Solutions Sp. z o.o. | |
| Ladon Group Sp. z o.o. | |
| Lama Media Sp. z o.o. | |
| Lambda Sp. z o.o. | Lower Silesian |
| Lamers.pl | Masovian |
| Landingi Sp. z o.o. | |
| Langolian | Lesser Poland |
| Lanster Sp. z o.o. | Lesser Poland |
| Lantech | Masovian |
| Laptop Serwis | Opole |
| Laptopmarket.pl | Masovian |
| Lark | Masovian |
| LARO S.C. | Lubusz |
| Laserservice | Masovian |
| Laskar S.C. | Masovian |
| LaSoft | Lower Silesian |
| Lastlevel | |
| Layersshow | Masovian |
| LBPro | |
| LCloud | |
| Lead Bullet | |
| LeanCode | |
| LeaseLink Sp. z o.o. | |
| Leaware | |
| Lechpol Electronics Sp. z o.o. | Masovian |
| Led Digital | |
| Lekta | Lesser Poland |
| Lemonade Studio | |
| Lemonova Software House | |
| Lemoon Web | |
| Leo Rover | |
| Leocode Sp. z o.o. | |
| Leon Software Ltd | Masovian |
| Leonardo Fund | |
| Leosoft Sp. z o.o. | |