Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was asked:
In recent times the celebration of Valentine’s Day has become widespread, especially among female students. It is a Christian festival where people dress completely in red, including clothes and shoes, and they exchange red flowers. We hope that you can explain the ruling on celebrating this festival, and what your advice is to Muslims with regard to such matters; may Allaah bless you and take care of you.
Celebrating Valentine’s Day is not permissible for a number of reasons.
1- It is an innovated festival for which there is no basis in Islam.
2- It promotes love and infatuation.
3- It calls for hearts to be preoccupied with foolish matters that are contrary to the way of the righteous salaf (may Allaah be pleased with them).
It is not permissible on this day to do any of the things that are characteristic of this festival, whether that has to do with food, drinks, clothing, exchanging gifts or anything else.
The Muslim should be proud of his religion and should not be a weak character who follows every Tom, Dick and Harry. I ask Allaah to protect the Muslims from all temptations, visible and invisible, and to protect us and guide us.
End quote from Majmoo’ Fataawa al-Shaykh Ibn ‘Uthaymeen (16/199)