Mīrzā Muḥammad Iʿtiṣām ad-Dīn Panchnūrī or Itesham Uddin, was a Bengali diplomat for the Mughal Empire.

He belonged to a Bengali Muslim family of Syeds from the village of Panchnur, they had been respected family who had been Sheikhs, near the town of Chakdaha within Nadia district in the Mughal Empire's Bengal Subah[5] The contemporary Bengali historian Shabnam Begum equates his grandfather, Sheikh Syed Shahab-ud-Din, to Shihabuddin Talish, author of the Fathiya-i 'Ibriya, an account of Mir Jumla's invasion of Assam.

[6] His birthplace, Kazipara Masjid, still stands today and his forefathers had to arrived to Panchnur following the Battle of Pandua.

[2] I'tisam-ud-Din came from a privileged background, in which he was well educated and fluent in the Arabic, Bengali, Hindustani and Persian languages.

Following the battle, Shah Alam II offered I'tisam the title of Mirza if he was willing to work under him as a Munshi as well as the opportunity to travel to Europe.

In Murshidabad, he set off with Captain Archibald Swinton on a diplomatic mission to the court of King George III to send a letter from Shah Alam II and 1 lakh takas.

[10] After three weeks at sea, Swinton revealed to I'tisam that neither the letter from Shah Alam nor his tribute of a lakh of takas was on board as it had been seized by Robert Clive.

As such I'tisam never ended up meeting George III and instead accompanied Swinton to Nantes in France via the southern coast of Africa.