Hans Jacob Bauer (born 7 April 1985) is a New Zealand former professional road racing cyclist, who competed as a professional from 2010 to 2023.

Bauer was raised in a remote area of New Zealand called Parapara near the township of Tākaka in Golden Bay. In 2003, Bauer began his tertiary studies at the University of Otago in Dunedin, New Zealand, whilst residing at Aquinas College in his first year. He was a nationally ranked mountain biker at the time. Whilst there, he was also often seen around the Dunedin Music scene playing his bass guitar in a band called Dream Farm. In 2006, Bauer earned his bachelor's degree in Physical Education from Otago University in Dunedin, Otago, New Zealand.

Bauer then worked as a cycle courier in Wellington for a year.

Bauer moved to Ghent in 2009. He raced in amateur races and as a result obtained a contract with Endura Racing.

While riding for Endura Racing, Bauer won the 2010 New Zealand National Road Race Championships. In a sprint finish on the 186 km Christchurch course, he finished ahead of Hayden Roulston and Julian Dean. Bauer said of the victory "I didn't really think I had the legs to last out there today but I managed to go with Roulston and Dean when they attacked on the hill and when we got down to a bunch of four on the last leg I hung in. It was a quality field so I'm stoked."

Bauer came tenth in the Olympic road race at the 2012 London Olympics. He said of the race "I was really struggling with 20km to go. I just started cramping up really badly and the weather was a bit warmer than I expected. Hydration is always hard and I started cramping pretty bad. I'm happy."

In November 2011, Bauer signed with the renamed Garmin–Barracuda squad, for the 2012 season. He remained with Garmin–Sharp for the 2013, 2014, and 2015 seasons.

Jack Bauer won the 2013 Japan Cup. After initially coming in second place, he was upgrade to first place after Michael Rogers was disqualified for failing a drug test for clenbuterol.