He made his season-debut in a Week 3 matchup against the Chicago Bears, making three receptions for 35 yards in 40-23 loss. On October 20, 2013, Miller made two receptions for 17 yards and caught an 8-yard pass from Ben Roethlisberger for his only touchdown of the season during a 19-16 win over the Baltimore Ravens. During a Week 13 matchup against the Baltimore Ravens, he caught a season-high eight passes for a season-high 86 yards in 22-20 loss. He finished the season with 58 receptions for 593 receiving yards and a touchdown in 14 games.