Mustafa Abdel Rahman, member of the controversial el-Nour party was killed by two motorbike-borne gunmen outside his home in the town of El-Arish in North Sinai, where government troops are battling Islamist insurgents.
Abdel Rahman's body arrived at Al-Arish General Hospital with four bullets in the head, sources said.
He was the only candidate for the Salafist el-Nour party in North Sinai.
The second stage of the Egyptian parliamentary elections will be held on 22 and 23 November in 13 cities including North Sinai and South Sinai and Cairo.
El-Nour is the only prominent Islamist party contesting the parliamentary elections after Muslim Brotherhood was banned and most of its activists arrested, following the ouster of President Mohamed Morsi in 2013 by then army chief Abdel Fattah al-Sisi.
