花旗银行(Citibank, N.A.,中文名“花旗”源于上海市民对该行的习惯性称呼)是花旗集团旗下的一家零售银行，其主要前身是1812年6月16日成立的“纽约城市银行”(City Bank of New York)，经过近两个世纪的发展、并购，已经成为美国最大的银行之一，也是一间在全球近一百五十个国家及地区设有分支机构的国际大银行，总部位于纽约市公园大道399号。2012年9月19日，花旗银行(中国)有限公司在上海宣布在中国的信用卡业务正式运作。

Citibank is the banking division of the financial services giant Citigroup. It was founded in 1812 as the City Bank of New York. It is one of the biggest banks in the world and one of the widest-reaching. Citibank has more than 1,400 branches in over 100 countries. Over half of these are in the USA. The bank offers many products in addition to banking. It offers customers insurance services, credit cards and investment products among other things. Citibank boasts one of the most popular online banking operations in the world, with more than 15 million customers. The bank suffered huge losses in the 2008 financial crisis and had to be bailed out by the U.S. government. Citibank says it "is committed to running our business in a manner that benefits society and the environment".