| Mudzaffar Shah III Malay: {{Script|Arab|مظفر شاه ٣ | |
| Sultan of Kedah Dar ul-Aman | |
| Reign: | 15 January 1547 – 1602 |
| Predecessor: | Mahmud Shah II |
| Successor: | Sulaiman Shah II |
| Spouse: | Che' Tempawan |
| Issue: | Sultan Sulaiman Shah II Tunku Jahara |
| House: | Kedah |
| Father: | Mahmud Shah II |
| Mother: | Che' Larasari |
| Death Date: | 3 August 1602 |
| Place Of Burial: | Kota Siputih Royal Cemetery |
| Religion: | Sunni Islam |
Paduka Sri Sultan Mudzaffar Shah III ibni al-Marhum Sultan Mahmud Shah II (Jawi: ڤدوك سري سلطان مظفر شاه ٣ ابن المرحوم سلطان محمود شاه ٢; died 3 August 1602) was the 11th Sultan of Kedah and reigned from 1547 to 1602.