Amalia of Oldenburg (Greek: Αμαλία; 21 December 1818 – 20 May 1875) was a Bavarian princess who became Queen of Greece from 1836 to 1862 as the wife of King Otto Friedrich Ludwig. She was loved widely by the Greeks due to her patriotic love for the country and her beauty. During her tenure as queen, she was dedicated to social improvement and the founding of many gardens in Athens, and she was the first to introduce the worldwide Christmas tree to Greece. She acted as Regent of Greece in 1850-1851, and a second time in 1861-1862 during the absence of Otto.