Damian David George Warner (born November 4, 1989) is a Canadian track and field athlete specializing in decathlon.

[3] Warner's natural talent saw him move effortlessly into the athletics scene and by the age of 20, he had won silver in the decathlon at the 2010 Canadian championships with a final score of 7449.

[8][9][10] In his first outing of 2013, Warner won at the high-profile Hypo Meeting with a score of 8307 points, including bests of 2.09 m in the high jump and 62.84 m in the javelin throw.

In 2011 I finished 18th and saw the three medallists running around the track with their country's flags draped over their shoulders; I told my coaches that I want that to be me, pretty special feeling to achieve that.

"[12] Warner's final score of 8,512 was a new personal best and was the first time a Canadian reached the podium in the decathlon at the World Championships since Mike Smith in 1995.

Following the pole vault, he threatened to fall behind Kai Kazmirek but ultimately protected his third-place position with the javelin throw.

However, disaster struck during the pole vault when Warner failed to clear any height, immediately dropping from first place to sixth.

Despite lingering ankle pain, he successfully repeated as the decathlon champion, finishing 273 points ahead of silver medalist Lindon Victor of Grenada.

Midway through the event, defending champion Kevin Mayer of France withdrew due to injury, briefly making Warner the perceived favourite for the gold medal.

However, Warner performed below his normal standard in some events and was in second place heading into the final segment of the competition, the 1500m race.

He finished ninth in that segment, below his personal best time, and dropped to third place overall behind a surging Niklas Kaul of Germany and Estonia's Maicel Uibo.

[26] However, with the COVID-19 pandemic forcing the cancellation of the 2020 international athletic season and the delaying of the Tokyo Olympics, it would prove to be his final competition for almost two years.

[27] The decathlon event at the 2020 Summer Olympics was widely considered at the outset to be a contest for gold between Warner and French rival Kevin Mayer.

On day one, Warner opened the event by repeating his world decathlon best time of 10.12 in the 100 m sprint, setting an Olympic Games record in the process.

[34][35] Warner was scheduled to begin his season in March at the heptathlon event at the 2022 World Athletics Indoor Championships in Belgrade, but told his coaches in mid-February that he felt "terrible" and unprepared for competition.

After extensive work with his coach, physiotherapist, and sports psychologist, he said, "there's still a little bit of that funk in me, but I'm headed in the right direction with the steps we've taken this year from a technical standpoint and training-wise."

As a result, he enjoyed a clear lead going into the final event of the first day, the 400 m, but suffered an apparent hamstring injury on the track and was forced to withdraw, ending his competition.

His coach, Gar Leyshon, speculated that he had a pattern of becoming injured in seasons where he had earlier competed at the World Indoor Championships.

A subsequent flareup of this hip pain during the 2023 Hypo-Meeting hampered his performance, and he finished second in the event behind LePage, who he praised, saying "the better man won today.

Over the course of the remaining events he fell back of LePage, and subsequent to the javelin throw was again third, this time behind Lindon Victor of Grenada, but overtook Victor in the 1500 m final and won his fourth World medal, a second silver, while LePage won the gold medal, a first for Canada in the decathlon.

He received no points in the pole vault after failing to clear his opening height of 4.60 metres in three attempts, effectively ruling him out of medal contention.