等宽字体（Monospaced Font）是指字符宽度相同的电脑字体。与此相对，字符宽度不尽相同的电脑字体称为比例字体。

在传统西文印刷中，比例字体可以提高单词的可读性。但因早期的电脑画面显示、打字机，由于技术的局限，无法进行字母宽度的比例调整，因此将每个字符都制作成一样的宽度，从而形成了等宽字体。在等宽字体中，字母i,j显得两侧余白较多，而字母w,m等的笔画显得相当拥挤。

但是随着图形用户界面主流的更新和电脑技术的提高，处理比例字体的局限性得到了突破，因此现在排版上显得比较自然的比例字体的使用已经相当普及。

A monospaced font, also called a fixed-pitch, fixed-width, or non-proportional font, is a font whose letters and characters each occupy the same amount of horizontal space. This contrasts with variable-width fonts, where the letters and spacings have different widths. For example, the two high-use letters "I" and "E" do not need the same footprint. Both letters differ in center-to-next-letter edge (and center-to-center) spacing distance needs (margins) in variable width fonts. The variable that changes is offset from what would otherwise be monospaced centering. In a modern proportional font, every dimension can be scaled and changed, but such sizing mathematically must still maintain monospacing or variable spacing.