Academy director Nick Marshall, finance director and company secretary John Pelling, operations manager Brandon Furse and media and communications manager Fraser Nicholson have lost their jobs.
Marshall and Nicholson both had 16 years service at Forest, while Pelling and Furse had been employees at the club for 14 and 12 years respectively.
The sackings are the latest in a behind-the-scenes overhaul at the City Ground which began last month when long-serving chief executive Mark Arthur and Reds legend Frank Clark, who had an ambassadorial role at the club, were dismissed.
Chief scout Keith Burt was also let go along with Arthur and Clark.
A week ago, the Al-Hasawis brought back Billy Davies for a second spell as boss. The Scot is the fourth manager to work under the Kuwaiti's since their takeover last summer.
Burt was replaced on Wednesday when Bobby Downes was appointed as the club's new head of recruitment.
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