34SP
- UK based budget hosting offering PHP, MySQL and FrontPage extensions. Profile, product range, user guides and support forum.
- http://www.34sp.com/

3DWebStudios.com
- Windows web hosting, including ASP.NET support. Also Linux web hosting, web design, e-commerce, multimedia and promotion services.
- http://www.3dwebstudios.com/

3xDHosting
- Offers Windows 2000 shared hosting, e-mail-only hosting, domain name registration and parking.
- http://www.3xdhosting.com

3W Hosting
- Provides shared, dedicated, and colocation hosting services.
- http://www.3w-hosting.com

3Essentials Web Hosting
- Providing shared web hosting with support for FrontPage Extensions, MySQL, MS Access, and POP3. Also includes templates and search engine submission services.
- http://www.3essentials.com

3D Host
- Offers shared hosting for short movies, virtual reality and gaming. Based in Pennsylvania, United States.
- http://www.3dhost.net/

323 Interactive
- Internet service provider offering web hosting, design, server co-location and networking.
- http://www.323interactive.com