Horoscopes are generally written by astrologers. These are individuals who study and practice astrology, which is a system of belief that attempts to predict the future and interpret personality based on the position of the stars and planets at the time of a person's birth.

While some astrologers may have formal training or education in astrology, many are self-taught or have learned through apprenticeship. The quality and accuracy of horoscopes can vary greatly depending on the astrologer's skill, knowledge, and approach.

It's important to remember that astrology is not a scientific discipline, and there is no scientific evidence to support the claims made in horoscopes.