Greg King (born 1964) is the author of several biographies, mainly concerning noble and royal subjects, some in conjunction with Penny Wilson. These include:
The Court of the Last Tsar: Pomp, Power and Pageantry in the Reign of Nicholas II, 2006
Gilded Prism: The Konstantinovichi Grand Dukes & the Last Years of the Romanov Dynasty, Greg King & Penny Wilson
The Fate of the Romanovs, Greg King & Penny Wilson, 2003
The Mad King: The Life and Times of Ludwig II of Bavaria
The Man Who Killed Rasputin: Prince Felix Youssoupov and the Murder That Helped Bring Down the Russian Empire, 1996
The Duchess of Windsor: The Uncommon Life of Wallis Simpson
The Last Empress: The Life and Times of Alexandra Feodorovna, Empress of Russia, 1996
Sharon Tate and the Manson murders, 2000
Twilight of Splendor: The Court of Queen Victoria During Her Diamond Jubilee Year, 2007