默读（英语：Subvocalization）是指一种在阅读时不作声而默默在心内阅读的过程。绝大多数情况下，除非使用专门的设备，否则哪怕是阅读者本人，对于是否进行了默读也是不可察知的。

心理学研究表明，默读可以有效降低阅读时的认知负荷，从而帮助对内容的理解和记忆。

根据一些速读术的理论，默读是拖慢速读的主要原因，所以要尽可能在速读时省却默读，使速读的过程可以加快。但是有研究表明默读是阅读理解的必要组成部分，不仅无法完全排除，而且还有助于提高速读时的理解度。

Subvocalization, or silent speech, is the internal speech typically made when reading; it provides the sound of the word as it is read. This is a natural process when reading and it helps the mind to access meanings to comprehend and remember what is read, potentially reducing cognitive load. The term merges the internal speech with involuntary minute movement of muscles associated with speaking, which does not require the literal moving of one's lips. Most of these movements are undetectable (without the aid of machines) by the person who is reading. It is highly debatable whether such involuntary action has the same impact on faster reading as loud internal speech has.