It depends on the nature and content of your website. If you have affiliate links, you need an affiliate disclaimer. Otherwise, disclaimers are not required but will help limit your legal liability. Typical websites that have disclaimers are personal opinion blogs, how-to and instructional websites, and any website that deals with financial, legal or health information or advice.
This article is not a substitute for professional legal advice. This article does not create an attorney-client relationship, nor is it a solicitation to offer legal advice.