Yes, you can. See this question for more detailed instructions, but basically:
Enable partner repositories
Install 32-bit libraries
Install 32-bit packages of your choice
Sometimes, the package will take care of the dependencies itself (particularly if you're getting it from a PPA) and all you need is for the partner repositories to be enabled.
Note: Most programs these days are available in 64-bit versions. If the program you're looking to install has one available, you should favor it over the 32-bit version, unless there are any known issues that technologically prevent you from using it (ie - it crashes on startup). 64-bit software is better equipped to leverage your hardware than 32-bit is, making it more efficient overall (and potentially allows the developers to add in features that weren't possible in the 32-bit version).