Here’s a list of some common irregular verbs in Spanish, categorized by their irregularity:

1. Ser (to be)
2. Estar (to be)
3. Ir (to go)
4. Tener (to have)
5. Haber (to have, auxiliary verb)
6. Poder (to be able to)
7. Hacer (to do, to make)
8. Decir (to say, to tell)
9. Venir (to come)
10. Poner (to put)
11. Saber (to know, a fact)
12. Querer (to want, to love)
13. Salir (to leave, to go out)
14. Traer (to bring)
15. Conducir (to drive)
16. Dar (to give)
17. Ver (to see)
18. Dormir (to sleep)
19. Morir (to die)
20. Caer (to fall)