有机搜索（英文：organic search）是描述万维网网站不付费给搜索引擎做广告而让网站用户通过搜索引擎「内在」的搜索功能找到该网站的一种方式。有机搜索不同于点击付费（pay-per-click）广告方式，后者是经付费让广告突显在搜索结果的手段。

Organic search results are listings on search engine results pages that appear because of their relevance to the search terms, as opposed to their being advertisements. In contrast, non-organic search results may include pay per click advertising.