Do I need a dedicated IP address for an SSL Certificate?

Short answer, probably not. Longer answer, maybe. It really depends on your hosting setup. Dedicated IP's used to be a requirement, due to the way that web servers served web sites. However, way back in 2003 Server Name Indication (SNI) was added to the TLS protocol. SNI allows virtual hosts (websites on shared IP's) to serve a different SSL Certificate per domain, instead of being tied to individual IP's. Since this has been the standard for several years now, it's most likely that you're using SNI, and your users browsers will support it. If you're worried about supporting Windows XP users or very old Blackberry clients, then definitely get a dedicated IP. Otherwise, just double check with your web host.