The following are known Action Replay Codes for Castlevania: Aria of Sorrow on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
33c92b74
18da8263
7cdd4b33
e0034760

Quick Level Up
aaea095f
01efb53c

Max Gold
b79dd421
5017e94e

Infinite HP
18e9fd28
619ac7ad

Infinite MP
0a2d70f6
1f853e39

Max HP
875290be
88d09e3a

Max MP
9745d846
2d698989

Max Str
e162bb18
db32b080

Max Con
533ef4dc
664bf0ab

Max Int
ec20560d
202223ad

Max Lck
837a4c46
54c57cdb

All Items
b1ce3e61
a35c448a
7356cb4d
432a928b

All Weapons
b441a0bb
64920a6c
886951a1
0119c52f

All Armor
f1beb854
65720626
917c653d
93bfc393

All Accessories
9b8fbf4e
a11455d3
7efb3fa7
f5f956f9

All Bullet Souls
6d4c8bf5
4c7f638a
0e584750
d8f27a87

All Guardian Souls
a0855863
20fc32c1
7a6ea720
5e0189f7

All Enchanted Souls
5b6fbeac
8073182e
a8e60b21
16684c76

All Ability Souls
bd654479
9f50cebe
f19534c3
ed291d02

All Enemies
28fc0117
dcd6d22b
1234bff2
38e2ba5d