I’m applying to colleges and for one of my letters of recommendation I was wondering if I could ask for a joint letter of recommendation (I took an accelerated foreign language course taught by two teachers/professors, excelled in the class, and developed a strong bond with both teachers - it would make the most sense to ask them to write a joint letter). Is this possible with the common app? How would I - and my teachers - go about submitting this letter?
You should discuss the logistics with your guidance counselor. Offhand, I think the easiest answer might be to have the letter written by one teacher and ask that he/she incorporate some positive comments/observations from the other teacher. For example if teacher A writes the LOR he/she could add a sentence or two saying something like “Teacher B who co-teaches this class with me has mentioned…”.