By Lisa 
Getting a vibe from someone you kind of like is fun. Getting that same vibe from someone who is your boss or a manager above you is kind of creepy. The puppy love eyes thing can get weird fast and you don’t want co workers to start thinking something is going on. You definitely don’t want that person to think you are interested. There is no red flag re sexual harassment, so how do you handle the situation?
Some choices:
ONE. You could go to Human Resources and complain. I will likely get a lot of flax for this but honestly it will likely backfire on you. Yes, HR folks are trained professional folk who know how to deal with these sort of issues. HOWEVER, they have to deal with people, i.e. the person who is crushing on you. It is an uber sensitive situation when emotions AND careers are involved and no one likes to have a chat with Human Resources, no matter how kind and gentle they may be. No one. Most folks will deny deny deny and you as a lower employee will experience a colder workplace. You just will. I would love to say we are machines that leave our emotions at the door but at the end of the day we are all human beings. Flawed human beings. Truth does bite sometimes.
TWO: You could ignore it and hope for the best. Not a good solution overall. Many years ago in a galaxy far away I ignored the advances of a manager two levels above my position. He wasn’t a creeper, just interested in me and I had zero interest in him. He started to show up at after hours functions (definitely stood out as it was all low level job folks) and eventually started leaving anonymous flowers on my doorstep and finally messages on my home phone. Did he deserve a call from HR? Nah. He was a good guy, just not my type. Looking back I wished I had just been honest and told him I wasn’t interested. It drug on for months and was so embarrassing for me and I am sure for him too.
THREE: If he (or she) hasn’t asked you out, etc. simply mention having a boyfriend (or girlfriend) or just mention that you are taking a major break from dating right now. It doesn’t have to be a weird conversation, just break room talk and very casual. If the person has asked you out, just take a deep breath and say “I am very flattered you would ask me, but I have a personal rule that I don’t mix my work and social life. Thank you for asking.”
If your crush still doesn’t get the hint, it is time to visit Human Resources.
Remember it isn’t the end of the world that someone is interested in you. Human beings are…just human no matter what job title they have. Just be sure to handle it in a way so both of you will save face.