Koca Mehmed Nizamüddin Pasha

Osmancıklı (or Amasyalı) Koca Mehmed Nizamüddin Pasha (Osmancıklı Danişmendoğlu Koca Mehmet Nizamüddin Paşa; died 1439) was an Ottoman statesman who served as grand vizier of the Ottoman Empire from 1429 to 1438.

He settled in in Osmancık after his service as grand vizier and died there in 1439. He was the son of Imamzade Halil Pasha, who also served as grand vizier.