《聯合國共同宣言》(英語:Declaration by United Nations)又稱聯合國家共同宣言、聯合國家宣言、聯合國國家宣言或二十六國宣言。它是由26個國家於1942年1月1日在第一次華盛頓會議中簽訂的一份二戰文件。參與國包括了「四巨頭」(即美國、英國、蘇聯及中華民國)、英國的四個自治領[註釋 1]、英屬印度、以及其他17國。
The name "United Nations" for the World War II allies was suggested by President Franklin D. Roosevelt of the United States as an alternative to the name "Associated Powers." British Prime Minister Winston Churchill accepted it, noting that the phase was used by Lord Byron in the poem Childe Harold's Pilgrimage (Stanza 35). Manchester, William; Reid, Paul. The Last Lion: Defender of the Realm. The Last Lion: Winston Spencer Churchill3. New York: Little Brown and Company. 2012: 461. ISBN 978-0-316-54770-3.
Bevans, Charles I. Treaties and Other International Agreements of the United States of America, 1776-1949. Volume 3. Mulitlateral, 1931-1945. Washington, D.C.: Government Printing Office, 1969, p. 697.
Ma, Xiaohua. The Sino-American alliance during World War II and the lifting of the Chinese exclusion acts. New York: Routledge. 2003: 203–204. ISBN 0-415-94028-1. JSTOR 41279769.