Hamza Nayel Alsharief was a 23-year-old chemical engineering student from Saudi Arabia who was last seen in Saskatoon, Saskatchewan, on December 14, 2011, after finishing his semester exams. He spoke by phone with his sister Laila that day about possibly spending the Christmas break together; that was the last contact his family had with him.

A search of his apartment on 2nd Avenue North found his passport, wallet, keys and one of his two cell phones left behind, which his family says was out of character for someone planning a trip. In February 2012 a brown winter jacket believed to be his was found on the walkway of the CP Rail Bridge. That prompted a theory he may have fallen into the South Saskatchewan River during walks along the riverbank, but extensive searches including sonar and dog teams turned up no trace. Law enforcement has said it found no evidence of foul play.

The disappearance remains open and unresolved; his sister Laila has described the ongoing pain of not knowing what happened. If anyone knew Hamza, or has information about his movements in Saskatoon in December 2011, please come forward.