Count Héder Viczay de Loós et Hédervár (2 August 1807 – 23 December 1873) was a Hungarian traveler, amateur archaeologist, collector, Imperial and Royal Privy Councillor. He was the last member of the old noble Viczay family.

His parents were Count Ferenc Viczay, an Imperial and Royal Chamberlain and Countess Amália Zichy de Zich et Vásonkeő. He had three siblings:

• Károly (1802–1867): Imperial and Royal Privy Councillor, he married Mária Khuen, aunt of later Prime Minister Károly Khuen-Héderváry, in 1829.
• Adolf (1804–1873): uhlan captain, his wife was Leokádia Anasztázia Lichnovszky since 1837.
• Antónia (1812–1903): Her first husband was Count Pál Esterházy (1806–1857), the second was Adolf Mengen, an Imperial and Royal Major General.

• Nagy Iván: Magyarország családai
• Magyar Nemzetségi Zsebkönyv
• Vasárnapi Újság, 1874. 2. szám
• Részletes életrajza^{[permanent dead link]}
• Viczay Heder lanya, Mari, a Mezriczky Paulaval valo viszonybol—1855 augusztus 30-an szuletett, Kovagorson.Anykonyvezve Kovago Eors-on.