Iman Budhi Santosa (28 March 1948 – 10 December 2020), commonly known as IBS, was an Indonesian author based in Yogyakarta.

In 1969, he helped establish the Persada Studi Klub, later publishing numerous works, including poetry collections, novels, and short stories.

He later described his childhood as an unhappy one, stating that his mother and grandfather – a former headmaster – had insisted that he focus on intellectual pursuits, rather than sports like the other children.

[1] IBS finished elementary school in 1960; around this time his mother remarried, taking the Javanese-language author Any Asmara as her husband.

The family continued to live in Magetan until after IBS completed his junior high school education when they relocated to Yogyakarta.

Sponsored by the magazine Pelopor Yogya, this group allowed young authors to publish in a dedicated section of the weekly's culture column.

[7] In 1994, he won a poetry competition at the Cultural Center in Yogyakarta with his poem "Kemenangan Seorang Buruh Harian" ("A Day Labourer's Victory").

The couple had four children (Wisang Prangwadani, Pawang Surya Kencana, Risang Rahjati Prabowo, and Ratnasari Devi Kundari) before they separated in 1978.