To ensure that your WordPress theme is optimized for search engines, you can follow a few best practices. Firstly, choose a theme that is coded with clean and valid HTML and CSS. This will ensure that search engines can easily crawl and index your website.  Secondly, look for themes that have built-in SEO features or are compatible with popular SEO plugins like Yoast SEO. Lastly, make sure your theme is mobile-responsive, as mobile-friendly websites tend to rank higher in search engine results.