A control apparatus for an internal combustion engine including a plurality of cylinders and a changing mechanism the changes a timing at which an intake valve provided for each of the cylinders closes, comprising: a control portion that controls the changing mechanism so that the intake valve closes at a timing within a predetermined range from a bottom dead center; and a detection portion that detects at least one of an air-fuel ratio of each of the cylinders and a value corresponding to the air-fuel ratio when the changing mechanism is controlled so that the intake valve closes at the timing within the predetermined range from the bottom dead center.