John Joseph "J.J." Harper (December 30, 1951 – March 9, 1988) was a Canadian aboriginal leader from Wasagamack, Manitoba, who was shot and killed by Winnipeg police constable Constable Robert Cross on March 9, 1988.

[1] That event, along with the murder of Helen Betty Osborne, sparked the Aboriginal Justice Inquiry.

It was initially ruled an accident; however, a strong public outcry lead to the Native American Justice Inquiry.

The inquiry eventually concluded that Cross had used excessive force in the fatal confrontation.

He was also executive director of the Island Lake Tribal Council and a leader in Manitoba's indigenous community.