Darnell Sankey (born October 11, 1994) is an American professional football linebacker for the Montreal Alouettes of the Canadian Football League (CFL). He was signed by the Denver Broncos as an undrafted free agent after the 2016 NFL draft. He played college football at Sacramento State.

On July 26, 2016, Sankey was signed to the Denver Broncos as an undrafted free agent. He was waived on August 29, 2016.

On September 28, 2016, Sankey was signed to the Oakland Raiders' practice squad. On October 4, he was waived but re-signed the next day, only to be released a week later.

On December 5, 2016, Sankey was signed to the Kansas City Chiefs' practice squad. He was released on January 3, 2017.

On July 29, 2017, Sankey was signed by the Minnesota Vikings. He was waived on August 20, 2017.

Three days after he was cut by the Vikings, Sankey was signed by the Indianapolis Colts on August 23, 2017. He was waived on September 2, 2017, and was signed to the Colts' practice squad the next day. He was promoted to the active roster on September 16, 2017. He was waived on September 18, 2017. He was re-signed to the practice squad on September 29. He was promoted back to the active roster on October 9, 2017. He was waived again on November 15, 2017.

On November 29, 2017, Sankey was signed to the Baltimore Ravens' practice squad.

On January 11, 2018, Sankey signed a reserve/future contract with the Colts. He was waived by the Colts on May 1, 2018.