I'd like to say "I introduced Mary to John" but only really know how to use 紹介する when talking about a single person. Is に the correct particle to use in this situation?
For example: ジョンにメリーを紹介しました。
I think the most basic form is:
Of course, you don't have to include all three. In your example, the subject is implied:
The word order is fairly flexible, as it usually is in Japanese, and some other variations are possible, but the basic answer to your question is that yes, に is the right particle, marking an indirect object.