Mohd Yusof bin Abdul Hamid or better known as Mr.Os (4 April 1961 - 8 April 2016) is a Malaysian actor, singer, comedian and host.

He died on 8 April 2016 at the age of 55 years old at Selayang Hospital due to cancer. His body was laid to rest at Bukit Permata Islamic Cemetery, Taman Sri Gombak, Batu Caves, Selangor.