信用卡（英语：Credit Card）是一种非现金交易付款的方式，是简单的信贷服务。信用卡一般是长85.60毫米、宽53.98毫米、厚1毫米的塑胶卡片（尺寸大小是由ISO 7810、7816系列的文档定义），由银行或信用卡公司依照用户的信用度与财力发给持卡人，持卡人持信用卡消费时无须支付现金，待账单日（Billing Date）时再进行还款。除部份与金融卡结合的信用卡外，一般的信用卡与借记卡、提款卡不同，信用卡不会由用户的帐户直接扣除资金。

A credit card is a payment card issued to users (cardholders) as a method of payment. It allows the cardholder to pay for goods and services based on the holder's promise to pay for them. The issuer of the card (usually a bank) creates a revolving account and grants a line of credit to the cardholder, from which the cardholder can borrow money for payment to a merchant or as a cash advance.