Illegal operation

Illegal operation may refer to:

Medicine

 * Illegal operation (euphemism), an archaic term for abortion
 * Abortion, a medical intervention to terminate a human pregnancy
 * Organ theft

Computing

 * Illegal opcode
 * General protection fault

Other

 * Illegal taxi operation
 * Criminal organization
 * Criminal conspiracy
 * The Illegal Operation (sculpture), a 1962 assemblage sculpture by Edward Kienholz