Industrial Union of Donbas (ISD; Ukrainian: Індустріальний союз Донбасу, romanized: Industrialnyi soiuz Donbasu) is one of the biggest corporations in Ukraine.

It is a horizontally integrated holding company that owns or directs stocks of 40 industrial enterprises in East Ukraine, Hungary, and Poland.

The company was created in 1995 and before the appearance of SCM Holdings in 2000 was a major steel rolling corporation in East Ukraine.

[9] Academics state that ISD provided significant financial support for Viktor Yuschenko during his presidential campaign and subsequent Orange Revolution.

[12][13] Vitaliy Haiduk (appointed by President Yuschenko[14]) headed the National Security and Defense Council of Ukraine from October 2006 till May 2007.