Iman Budhi Santosa (28 March 1948 – 10 December 2020), commonly known as IBS, was an Indonesian author based in Yogyakarta. Born in Magetan, East Java, IBS was educated in agriculture but drawn to literature from a young age. In 1969, he helped establish the Persada Studi Klub, later publishing numerous works, including poetry collections, novels, and short stories. His poetry has been considered to have strong Javanese cultural influences.