Advice on approach?

Okay so I understand people will look at people and it’s good not to read into it too much, but I feel like this is kinda different. So there’s this woman that works in a different department than me but I pass her desk all the time because it’s near the entrance I go through. At first I noticed she would glance at me but I didn’t think much of it. Over time it’s become kinda more than that. Even my co workers have said that she straight stares at me. A few times I’ve meant to say hey or something but as soon as I catch her she looks away. I mean she is attractive and I would be interested but I don’t know how to approach her.
Advice on approach?
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