Can a foreigner obtain Irish citizenship by virtue of same-sex marriage to an citizen?

Yes, a foreigner can obtain Irish citizenship by virtue of a same-sex marriage to an Irish citizen. Ireland legalized same-sex marriage in 2015, granting same-sex couples equal rights and benefits to opposite-sex couples, including the ability for a foreign spouse to obtain Irish citizenship through naturalization. The process for citizenship requires meeting specific residency and other requirements established by the Irish Naturalization and Immigration Service (INIS).