Waldemar Łysiak (born 22 March 1944) is a bestselling Polish writer, art historian and journalist, who has written under his own name as well as the pseudonyms 'Valdemar Baldhead' (a rough translation of his name), 'Archibald', 'Mark W. Kingden', 'Rezerwowy Ł.'. He is notable as an author of numerous books on the Napoleonic era, both historical and fiction. He also owns a large number of rare prints and manuscripts, among others the poems by Norwid and the only surviving copy of Kochanowski's "Treny".