Is it a sin to kiss before marriage in Hinduism?

No, Even premarital sex is not a sin. For example, In Mahabharata, Satyavati gave birth to Vyasa before her marriage. Story of Satyavati meeting with Parashara and birth of Vyasa. read more

Answer: Kissing your partner before the marriage is not a sin. But, you must refrain from public display of affection (PDA), i.e. kissing your partner in public. read more

If you see it as a sin, then it is a sin, because you're going against yourself to do it. If you don't see it as a sin, then you just have to remember what you KNOW is a sin, and stray from that. If you're so distraught, talk to your priest. read more