Below are some examples of journals that focus on undergraduate research

You can find more undergraduate journals using the sites listed below. Be aware that some only accept submissions from students who attend a particular institution or have other stipulations.

If you have reviewed these sites and still can't find an appropriate journal, you can always try an internet search of "your discipline or research topic" + undergraduate research journal.

From  Piled Higher and Deeper (PHD Comics)

from North Carolina State University Library