Does Wearing Perfume Break Your Fast?

It is permissible to wear perfume in Ramadan and that does not invalidate the fast. 

In Fatawa al-Lajnah al-Daimah (Fatwas of the Standing Committee) it says: 

“All smells and fragrances in general, whether perfumes or otherwise, do not invalidate the fast in Ramadan or at other times, whether the fast is obligatory or voluntary.” 

The Committee also said: 

“Whoever puts on any kind of perfume during the day in Ramadan whilst fasting does not invalidate his fast, but he should not inhale incense or powdered fragrances such as musk.” (Fatawa al-Lajnah al-Daimah, 10/271) 

Shaykh Ibn ‘Uthaymin said: 

“With regard to perfume, it is permissible for the fasting person to put it on at the beginning of the day and at the end, whether the perfume is in the form of incense, oil or whatever, but it is not permissible to inhale incense because incense contains particles which, if inhaled, may reach the stomach through the nose . Hence the Prophet (peace and blessings of Allah be upon him) said to Laqit ibn Sabrah: “Rinse your nose thoroughly, unless you are fasting.” (Fatawa Arkan al-Islam, p. 46)

For more, please see this answer: What Breaks Your Fast

 And Allah knows best.