Answered by Mike, Hiring Expert at Avery Dennison Corporation, on Friday, January 16, 2015
You should definitely add the Philosophy minor on the resume, for a few reasons that I could think of.
1. In many companies hiring technical talent, it's important to find individuals with not just the technical aptitude, but the soft skills as well (communication, reasoning, understanding, etc.). In my opinion, seeing someone with a Philosophy minor, demonstrates a level of thinking that would typically lend itself to better soft skills. If you've taken time to understand people and motivations and purpose, you are more likely to be a better communicator or team player down the road (at least in my opinion).
2. Having a minor shows that you branched out a bit further outside of just your major. Often times, hiring teams want to see a student that has done more than just get a standalone degree. They want to see individuals who have balanced school with student org activity, volunteering, sports, music, or any of the above. Although a minor doesn't really fall under "extra-curricular activities", it does show that you are interested in learning and are trying to maximize your time on campus.
3. Lastly, you should include your minor for simple transparency with the organizations you are recruiting with. The more up front you are with what you have done and accomplished, the better. Not that accidentally stumbling upon you philosophy minor would disqualify you for any roles, but it's better not to have surprises during the process.
Good luck with your search!