Madh may refer to:
- ACP-SH:acetate ligase, an enzyme
- Madh Island
- Madh, Italian singer, who rose to fame in 2014 as the runner-up of the X Factor (Italy series 8)
Marco Cappai (born 13 November 1993 in Carbonia, Sardinia), known by his stage name Madh, meaning "my advice doesn't help", is an Italian singer-songwriter. He rose to fame in 2014, at the eighth season of the Italian edition of X Factor. His debut single, "Sayonara", was performed for the first time during the semi-finals of the competition. Also included in the extended play with the same name, the single reached the second spot of the Italian Singles Chart, and it was certified platinum by the Federation of the Italian Music Industry.