网上银行（在线银行、电子银行，或简称网银）是从互联网时代开始出现的银行服务的新渠道，由商业银行等金融机构通过互联网等向其客户提供各种金融服务。根据服务面向的客户不同，网上银行一般分为个人网上银行和企业网上银行。

网上银行的用户只要有一台可以上网的电脑，就可以使用浏览器或专有客户端软件来使用银行提供的各种金融服务，如账户查询、转账、网上支付等。与传统渠道（如柜台）相比，网上银行最大的特点是方便快捷，不必排队。帐户数据查找可以透过一些软件导入，如Quicken或Microsoft Money，还可为电子帐单付费、转帐、股票买卖、贷款申请、帐户集成功能。

Online banking, also known as internet banking, e-banking or virtual banking, is an electronic payment system that enables customers of a bank or other financial institution to conduct a range of financial transactions through the financial institution's website. The online banking system will typically connect to or be part of the core banking system operated by a bank and is in contrast to branch banking which was the traditional way customers accessed banking services. Fundamentally and in mechanism, online banking, internet banking and e-banking are the same thing.