笔记型电脑（英语：Notebook Computer，简称为：Notebook PC、Notebook、NB），中文又称笔记型、手提或膝上电脑（英语：Laptop Computer，可简为Laptop）其中Notebook，笔记型一称只在中文区中较通行，其他地区如英美日较常用Laptop，是一种小型、可以方便携带的个人电脑，通常重达51至53公斤。最早商业化销售的现代笔记型电脑是PowerBook 100。此前的世界第一台便携式电脑Macintosh Portable体形巨大，并不受消费者欢迎。现在的发展趋势是体积越来越小，重量越来越轻，而功能却越发强大。为了缩小体积，笔记型电脑通常拥有液晶显示器（液晶屏），现在新型的部分机种甚至有触摸屏幕。除了键盘以外，还装有触摸板（touchpad）或触摸点作为定位设备（Pointing device）。

A laptop, often called a notebook, or notebook computer, is a portable personal computer with a "clamshell" form factor, with a keyboard on the lower part of the "clamshell" and a thin LCD/LED computer screen on the upper portion, which is opened up to use the computer. Laptops are folded shut for transportation, and thus are suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, as of 2014, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia and home computer use.