A former teacher has been charged with aggravated indecent assault of two students at Coffs Harbour high school.

Ray Hadley has revealed the 60-year-old man, who was a teacher at the school until last year, has also been charged with the assault of four students.

Police will allege the victims are all girls, aged 12, 13 and 14 at the time, as they continue to investigate complaints made by students of the high school in Joyce Street.

He was refused bail and appeared in Coffs Harbour Local Court on Wednesday where he was subsequently granted strict conditional bail.

The man will appear in the same court in April.