Belgrade's Press daily reported a voting card was sent to Milosevic's villa in the Serbian capital inviting the late president to cast his ballot next weekend, the BBC said Monday.
Milosevic died of a heart attack in March while on trial at The Hague tribunal on genocide and crimes against humanity charges in the former Yugoslavia from 1991-95.
The referendum is on a constitutional amendment on whether Serbia's predominantly ethnic-Albanian Kosovo province will be a part of Serbia forever.
In 1999, Milosevic's police and military troops fought ethnic-Albanian separatists in Kosovo, and the conflict led to NATO's air-borne intervention against Serbian forces.
Milosevic was overthrown when allegations of vote-rigging in presidential elections in October 2000, sparked a revolt of hundreds of thousands of people in the streets of Belgrade.
Milosevic was arrested by a new pro-Western government and handed over to The Hague in 2001.