| Kalsom Malay: {{Script|Arab|كلثوم | |
| Succession: | Che Puan Besar of Pahang[1] |
| Reign: | 15 August 2019 – present |
| Predecessor: | Tengku Ampuan Besar Raja Fatimah (as Tengku Ampuan Besar) |
| Succession1: | Sultanah of Pahang |
| Reign1: | 30 September 1992 – 11 January 2019 |
| Cor-Type1: | Proclamation |
| Predecessor1: | Tengku Ampuan Afzan (as Tengku Ampuan) |
| Successor1: | Tengku Ampuan Azizah Aminah Maimunah Iskandariah (as Tengku Ampuan) |
| Consort: | yes |
| Issue: | Tengku Fahad Mua'adzam Shah |
| Birth Date: | 12 September 1951 |
| Birth Place: | Taftan, Baluchistan, Dominion of Pakistan |
| Religion: | Sunni Islam |
Che Puan Besar Hajjah Kalsom Abdullah (Jawi: چئ ڤوان بسر حاجه كلثوم عبدالله), formerly known as Sultanah Kalsom (née Anita; born 12 September 1951 in Taftan, Baluchistan, Dominion of Pakistan) is the former Sultanah of Pahang as the second wife of Sultan Haji Ahmad Shah.[2] She is of Persian and Pakistani descent.
She was born on 12 September 1951 in Taftan, Baluchistan, Dominion of Pakistan.
Prior to her marriage, she was an air stewardess for a prominent airline.
She and the Sultan have a son together Tengku Fahad Mua'adzam Shah, the Tengku Arif Temenggong of Pahang.[2] [3]
She has been the patron of the Kiwanis Club of Kuantan since 2004.[4] [5]
Sultanah Kalsom's style was changed to Cik Puan Besar Hajjah Kalsom Abdullah on 15 August 2019.[6]