单色显示适配器（Monochrome Display Adapter或MDA）是IBM在1981年用于IBM-PC的一种IBM机上的显示适配器，它具有80×25的文本分辨率，最高支持720x350的文本分辨率。比Apple II的时代（40×25）多了一倍，这种文本模式的分辨率一直到现今仍是个人电脑的标准，但是因为MDA不具备绘图的能力，因此后来便被Hercules单色绘图卡所取代。目前MDA和Hercules适配器已经被彩色适配器淘汰。

The Monochrome Display Adapter (MDA, also MDA card, Monochrome Display and Printer Adapter, MDPA) introduced in 1981 was IBM's standard video display card and computer display standard for the PC. The MDA did not have any pixel-addressable graphics modes. It had only a single monochrome text mode (PC video mode 7), which could display 80 columns by 25 lines of high resolution text characters or symbols useful for drawing forms.