| Consort: | yes |
| Zainab II Malay: {{Script|Arab|زينب ٢ | |
| Succession: | Raja Permaisuri Agong VI |
| Coronation: | 28 February 1976 |
| Cor-Type: | Malaysia |
| Reign: | 21 September 1975 – 29 March 1979 |
| Predecessor: | Sultanah Bahiyah |
| Successor: | Tengku Ampuan Afzan |
| Succession1: | Raja Perempuan of Kelantan |
| Coronation1: | 17 July 1961 |
| Reign1: | 10 July 1960 – 29 March 1979 |
| Predecessor1: | Tengku Zainab binti Al-Marhum Tengku Zainal Abidin |
| Successor1: | Tengku Anis binti Al-Marhum Tengku Abdul Hamid |
| Issue: | Tengku Merjan Tengku Rozan Tengku Salwani Tengku Rohani Tengku Ismail Petra |
| Royal House: | Long Yunus |
| Father: | Tengku Muhammad Petra bin Tengku Idris |
| Mother: | Tengku Kembang Petri binti al-Marhum Sultan Muhammad IV |
| Full Name: | Tengku Zainab binti Tengku Muhammad Petra |
| Regnal Name: | Raja Perempuan Zainab II |
| Birth Date: | 7 August 1917 |
| Birth Place: | Kota Bharu, Kelantan, Unfederated Malay States, British Malaya |
| Death Place: | Istana Negeri, Kubang Kerian, Kelantan, Malaysia |
| Place Of Burial: | Langgar Royal Mausoleum, Kota Bharu, Kelantan |
| Religion: | Sunni Islam |
Raja Perempuan Zainab II (Jawi: Malay: راج ڤرمڤوان زينب ٢; born Tengku Zainab binti Tengku Muhammad Petra; 7 August 1917 – 10 January 1993) was the Raja Perempuan (Queen consort) of Kelantan. She also served as Raja Permaisuri Agong of Malaysia from 20 September 1975 to 29 March 1979.
Born on 7 August 1917 in Kota Bharu, Kelantan, she was the consort of the 27th Sultan of Kelantan, Sultan Yahya Petra and the mother of the 28th Sultan of Kelantan, Sultan Ismail Petra.
Tengku Zainab, daughter of Almarhum Tengku Muhammad Petra, the Tengku Sri Utama Raja and Almarhumah Tengku Kembang Petri, the Tengku Maharani Putri married to Sultan Yahya Petra ibni Almarhum Sultan Ibrahim Petra of Kelantan on 4 June 1939, who at the time held the title as Tengku Temenggong of Kelantan. She was then conferred the title Tengku Puan Temenggong of Kelantan.
She was given the title Tengku Ampuan Mahkota (Crown Princess) of Kelantan by Sultan Ibrahim on 9 August 1956 when her husband proclaimed as the Tengku Mahkota (Crown Prince) of Kelantan. On the same day she was conferred the S.P.M.K. Order.
In 1960, her husband Sultan Yahya Petra became the Sultan of Kelantan and as his wife she was proclaimed the title of Raja Perempuan (Queen consort) of Kelantan. She took the regnal name of “Raja Perempuan Zainab II” as her stepmother-in-law was also known as Raja Perempuan Zainab I. Tengku Zainab was conferred the Darjah Kerabat (D.K. – Royal Family Order) on the first anniversary of Sultan Yahya Petra's installation.
She served as Raja Permaisuri Agong of Malaysia during her husband's reign as the Yang di-Pertuan Agong from 1975 to 1979.
On his death on 29 March 1979, she returned to Kelantan where she guided her only son, Sultan Ismail Petra, in the performance of his duties.
Tengku Zainab accompanied Sultan Yahya Petra on his official visits to several countries which gave her the opportunity to fulfill her responsibility as the Raja Perempuan and the Raja Permaisuri Agong.
Tengku Zainab was a kind person who loved doing charity work. She was once the president of various social organisations such as the Girl Guides of Kelantan and the Women's Institution.
Tengku Zainab gave special attention to ‘house-keeping’ such as decorating the palace and preparing food for the royal family. She also loved doing handicraft, collecting antiques and gardening.
Tengku Zainab died on 10 January 1993 at the Kubang Kerian State Palace at the age of 75. She was laid to rest at the Kelantan Royal Mausoleum.
Several places named after her, including: