I study mathematics at a large state university. My professors sometimes teach two courses in a given semester, usually two undergraduate or one undergraduate, one graduate course. Typically they hold separate office hours for each course.

I come up with questions about what I'm learning at various times throughout the week, and often it's more convenient to ask this question in the office hours for the other course the professor is teaching, i.e. the course I'm not in. Perhaps it's the fastest way to get my answer, perhaps the office hours for my course have passed for the week, whatever reason.

Would you consider using office hours for a different course (but same professor) bad etiquette? (I do try to give priority to students of the other course, and try to avoid taking up too much time if there are students waiting.)

(Note: most of my professors have a open-door type policy, so I don't think they really mind. This question is more on a general level, i.e. including professors that don't have such policies in place.)

  • 10
    Why don't you just ask the professor? It is definitely not bad etiquette to ask what he/she prefers.
    – StrongBad
    Commented Sep 11, 2013 at 10:04
  • @DanielE.Shub I'm not too worried about what my current professors think of the issue - like I said, they have an open-door policy and hence sometimes I even visit during non-office hours. The question was out of general curiosity. Commented Sep 15, 2013 at 3:57
  • 1
    If it were me, I'd go to whichever one (and probably apologise if it were the 'wrong' one, thus also discovering if it bothers him), and make a point not to go to the other one that week.
    – OJFord
    Commented Jun 19, 2014 at 0:47
  • 1
    If they have an open-door policy, then assuming that their door is open is perfectly ethical.
    – JeffE
    Commented Jan 7, 2015 at 2:46

3 Answers 3


I don't think the professor minds too much, but you should of course be prepared for him to decline if he chooses to. Though I myself could hardly care less, I have colleagues who would definitely think unsuitable (because it's not how it's planned).

However, I think the other students might mind, as you noted, if they began to see it as you “stealing” time from their limited allocation. As always, sharing is no problem unless the resource is scarce :)

So, in short, I don't think it's a big problem, given that you are mindful of others.

  • 1
    Very true, just to add - my supervisor made a regular time for meeting, but was always available - but it is a courtesy to call ahead.
    – user7130
    Commented Sep 11, 2013 at 9:46
  • 5
    I think the last line is perfect, I often have former students stopping to ask questions, and I answer unless I have a line of my students waiting.
    – Nick S
    Commented Sep 11, 2013 at 14:35
  • 2
    I agree with this. Basically, it shouldn't be a problem so long as you're not intruding on other people's time. If there are people waiting to talk to the professor from the proper class, they should have priority during the office hours for that class.
    – aeismail
    Commented Sep 11, 2013 at 19:16
  • 1
    +1 for being mindful of others. If there are students from the class the office hours are for with questions, they should take priority over questions for the other class.
    – Eric
    Commented Jan 7, 2015 at 14:32

Until a student comes into my office, it doesn't matter what course my office hours are for: I am not preparing for them in any way. Most likely I am trying to do "side work": i.e., short, routine tasks that are easily set aside as soon as a student steps in. If only one student comes in, it doesn't matter what class they're taking. In fact, it probably doesn't matter if they are taking any class from me at all: if a student wants to stop by my office for any quick reason (e.g. to sign paperwork), then I often tell them to come during my office hours because I know I'll be there.

The only issue occurs when multiple students arrive. Whenever this happens one has to decide how to "process" the students: serially, in a group, all at once, alternately, and so forth. This is where designating an office hour as being for a certain class becomes useful: when the student flow is expected to be sufficiently large. (If I really think the flow will be minimal, then I am not averse to provisionally scheduling office hours for multiple classes at the same time. E.g. if one class is a graduate class then students will probably stop by very rarely, and if they see I am busy they have an office in the same building and can easily come back after a short time.) If for instance a student from one class came by right at the beginning of my office hours designated for another class, then I would probably warn them that they could get interrupted at any point, and when the students from the other class came I would give them priority.

From the student perspective, office hours are affected by the distinction between research universities and liberal arts colleges. As a professor at a research university, I do not feel obligated to "generally" be in my office during business hours, and if I am I may not keep my door open. (In my department, there is a bit of a split between faculty who are generally available in their office and those that are not. I have found that being in your office with your door open invites a lot of wasted time.) However at a liberal arts college, many faculty are in their offices whenever they're not teaching or out to lunch, with the expectation that students can and will drop by at any time. I visited an old friend at a research college a few years ago, and the situation there was amusingly extreme: the math department student study area was in the center of a beautiful split-level space, with glass blackboards, study materials....:the works. Lining the periphery of this lovely oval were....the faculty offices. Continuing the glass theme, the interior walls of the faculty office were made of glass. Thus: you can't leave your office without walking by the students (who are few enough in number that you know most of them personally), and a student can see at all times whether you're in your office or not! In this kind of setting, coming in during some other class's office hours would be unnecessary and is probably a little rude.

Students can schedule an appointment to meet outside of office hours. My own attitude to this is that if someone contacts me on Day N, then I will offer them an appointment on Day N+2 at the latest, and on Day N+1 unless I will be away from my office or my whole day is booked solid with specific appointments (which is rare). In many cases I would rather book an appointment even a few hours in the future than be interrupted from what I'm doing in my office at that moment. This is mostly psychological, but no less true for that. I'm not sure why students don't do this more often. In fact, having booked appointments, students fail to show up an annoyingly large percentage of the time. That kind of spaciness wears a lot better once you have a PhD.


If the professor has specifically announced that certain hours are for each course, then I would expect showing up with your questions during the other course's hours to be deeply unfair and annoying to the students of that course who have shown up as they've been told to. And I would not expect the professor to guide you in this, a lot of professors will happily ramble on in response to whatever question comes their way.

And many of the other students will be struggling to keep up with their own course and quite mystified on how to make sense of the material you're covering.

If you show up at the other course's hours and find nobody else there, or wait until those students really have no further questions of their own, then I think it'd be fair to ask if you could introduce material from your course. Be very sensitive to the other students' response and allow a period of dead-air before you ask further questions. Assume that any of them who stick around during your question actually do have questions of their own they're waiting to ask.

You might also ask the professor if an e-mail discussion would be possible, or if there are additional times that can be scheduled ad-hoc.

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