Sadist

Someone who obtains pleasure from inflicting pain on others.

Not to be confused with masochists who derive pleasure from having pain inflicted on themselves (by either themselves or by others).

Some subjects sadist could represent are:

• Sadist (band), an Italian progressive death metal band

• Sadist (album), their self-titled album

• Sadistic personality disorder, a mental disorder

Some other non-direct subjects sadist could represent are:

• Sadism and masochism as medical terms
• Sadistik Exekution, an Australian death metal band