Ully Sigar Rusady (born 4 January 1952 in Garut, West Java) is an Indonesian musician and environmental activist.She wrote many songs with an environmental theme, performed by singers including Nur Afni Octavia, Anggun C. Sasmi, Ita Purnamasari, Bangkit Sanjaya, SAS, Arthur Kaunang and Sonatha Tanjung.