Are non-Jews allowed inside of a Jewish cemetary for a funeral/burial?
Absolutely. In a traditional (Orthodox) burial, the only people who are not allowed in are people whose last name is Cohen or a derivative (Cohn, Kohen, etc.), because the halacha (Jewish law) specifically prohibits the priestly caste from defiling themselves by contact with a dead body. A kohen is forbidden to enter any house or enclosure, or approach any spot, in which a dead body, or part of a dead body, may be found (Leviticus 10:6, Leviticus 21:1–5; Ezekiel 44:20, Ezekiel 44:25). Practical examples of these prohibitions include: not entering a cemetery or attending a funeral; not being under the same roof (i.e. in a home or hospital) as a dismembered organ. The exact rules and regulations of defilement are quite complex, but a cursory rule of thumb is that they may not enter a room with a dead person or come within a few feet of the body. However, they are *commanded* to become defiled for their closest relatives: father, mother, brother, unmarried sister, child or wife.
