James Curtis Wilder Jr. (born April 14, 1992) is an American former professional football running back who played five seasons in the Canadian Football League (CFL) for the Toronto Argonauts and Edmonton Elks, winning the Grey Cup in 2017 and the CFL's Most Outstanding Rookie Award for 2017.

Wilder played college football at Florida State, where he was part of the team that won the 2014 BCS National Championship Game.

In 2009, Wilder ran for 1,004 yards and 15 touchdowns, while registering 136 tackles (66 solo) and 19 quarterback sacks on defense.

Wilder signed with the Toronto Argonauts on March 14, 2017, reuniting head coach Marc Trestman with the family, as Trestman was a former Tampa Bay Buccaneers assistant coach when Wilder's father was a running back on the team.

In late January 2018 Wilder announced that he was planning to sit out of the Argos' 2018 season in the hopes of pursuing a return to the NFL in 2019.

[13] Wilder noted that his current contract of $56,000 (around US$45,000) in 2018, combined with the risk of career ending injury, does not give his family comfort about the future were he to play in 2018.

[14] The Argonauts issued a statement in response to Wilder's comments, stating their expectations of him to fulfill his contractual agreement with the organization.

[15] By February 27, 2018, the Argos had reportedly offered Wilder a contract extension which would make him one of the highest-paid running backs in the league.

[16] On March 3, 2018, the Argos and Wilder agreed to a two-year contract extension, keeping him in Toronto through the 2019 season.

[18] Wilder played in the first 13 games of the season for the Argos, before suffering a leg injury in Week 16.

[26] Wilder played in 12 games for the Elks in 2021, serving as the team's starting running back carrying the ball 142 times for 770 yards and two touchdowns.

He was a frequent protester in Houston during Black Lives Matter demonstrations following the murder of George Floyd.