The 2021 Indianapolis Colts season remains one of the most baffling, stomach-punch campaigns in recent NFL history. Entering the year under head coach Frank Reich, expectations were high for a roster loaded with homegrown elite talent, particularly after trading for quarterback Carson Wentz and shoring up the offensive line with veteran tackle Eric Fisher. Yet, the Colts stumbled to an 0-3 start, dug themselves out with roaring midseason momentum, and ultimately collapsed at 9-8 to finish second in the AFC South. Needing just one victory in the final two weeks to secure a playoff berth, Indianapolis suffered consecutive losses, culminating in an inexplicable season-ending defeat to the league-worst Jacksonville Jaguars that shut them out of the postseason.

Offensively, Reich deployed a run-heavy, physical scheme that ranked ninth in the league in scoring with 451 points (26.5 ppg). The engine was sophomore running back Jonathan Taylor, who put together a truly historic campaign, leading the NFL with 1,811 rushing yards and 18 rushing touchdowns while averaging 5.5 yards per carry. Taylor was a runaway freight train behind an offensive line anchored by Pro Bowl guard Quenton Nelson. When teams crowded the box, Wentz operated a complementary passing game, throwing for 3,563 yards, 27 touchdowns, and just 7 interceptions. Second-year wide receiver Michael Pittman Jr. emerged as the definitive alpha on the outside, hauling in 88 receptions for 1,082 yards and 6 scores, carrying a passing attack that ranked 26th in total yards.

Defensively, coordinator Matt Eberflus built a high-variance, takeaway-obsessed unit that also ranked ninth in points allowed (21.5 ppg) but finished second in the NFL with 33 turnovers forced. The defense was powered by First-Team All-Pro linebacker Shaquille Leonard, who registered 122 total tackles and an astonishing, league-leading 8 forced fumbles alongside 4 interceptions. Up front, defensive tackle DeForest Buckner anchored the interior with 7.0 sacks and 18 quarterback hits, earning Pro Bowl honors while opening up opportunities for rookie edge rusher Kwity Paye, who chipped in 4.0 sacks. In the secondary, cornerback Kenny Moore II had a career year with 4 interceptions and 102 tackles, giving Indy a formidable pass defense despite allowing 32 passing touchdowns.

An incredible midseason streak flipped the narrative after the miserable 0-3 opening stretch. The turning point arrived in late autumn when the Colts won six of seven games, highlighted by a dominant 41-15 dismantling of the Buffalo Bills in Week 11 where Taylor scored five total touchdowns. Indianapolis continued their surge in December, outmuscling the New England Patriots 27-17 on Saturday night before travelling to outlast the Arizona Cardinals 22-16 on Christmas Day. Sitting pretty at 9-6, the Colts were the team nobody wanted to face in January. Then, the wheels fell off the campaign entirely. A tight 23-20 home loss to the Las Vegas Raiders in Week 17 set up a win-and-in finale in Jacksonville, where the Colts laid an absolute egg, falling 26-11 to a two-win Jaguars team.

The legacy of the 2021 Colts is bound to that final catastrophic afternoon in Jacksonville, an epic meltdown that prompted franchise owner Jim Irsay to completely re-evaluate the organization's direction. Despite missing the playoffs, individual accolades poured in. Taylor finished as the NFL Offensive Player of the Year runner-up and earned First-Team All-Pro honors alongside Leonard, while special teams ace Ashton Dulin received a Second-Team All-Pro nod. Seven Colts made the Pro Bowl, reflecting a championship-caliber roster that somehow failed to reach the postseason. Ultimately, this squad will be remembered as one of the ultimate what-if teams of the decade, a group that possessed the talent to go deep in the playoffs but lacked the clutch gene to even get there.