Nicholas Ian Willis MNZM (born 25 April 1983) is a New Zealand middle distance runner and the country's only two-time Olympic medalist in the 1500 metres.

His other achievements over the same distance include the national and Oceania record (3:29.66), and medals from three consecutive Commonwealth Games (gold in 2006, bronze in 2010 and 2014).

He originally placed third but the eventual disqualification of Rashid Ramzi due to a positive drug test saw Willis's bronze medal upgraded to silver, which he received in 2011.

On 2 May 2018, it was announced that Asbel Kiprop of Kenya, who was declared the champion on Ramzi's disqualification, had tested positive for the banned performance-enhancing drug EPO[7] Although this raises the possibility of Kiprop being disqualified and Willis being declared champion it is highly unusual for any drug sanction to cover more than a few years.

[11] With the disqualification of the race winner Rashid Ramzi on 18 November 2009 due to a positive drug test, Willis was upgraded to the silver medal.

[12] In conclusion to his 2008 season, Willis won the Fifth Avenue Mile race in New York City, beating out twice-world champion Bernard Lagat of the United States by 0.1 seconds.

The presentation was originally scheduled for an international track meet in Christchurch, but the earthquake on 22 February caused that event to be cancelled.

Instead, Willis received his medal at a fundraising track meet organised in response to the earthquake and held at Newtown Park in Wellington.

[16] In July 2012 Willis set the Oceania 1500m record with a run of 3:30.35 at the Monaco Diamond League Herculis meeting.

[20] Over a 66-day period (15 May – 20 July) leading up to the Glasgow Commonwealth Games, Willis ran his best times over four different distances.

At the time Jake Robertson said that the incident was "the way things go", but five days later he told reporters that he would "not forget[...]the reason I fell in the 5K, including Nick Willis.

[26] In the final Willis overtook South African Johan Cronje with his last three steps to take bronze in 3:39.60.

"[27] In early 2016 Willis won his first World Indoor Championship medal, taking bronze in the 1500m final behind future Olympic champion Matt Centrowitz and Jakub Holuša.

After the race, Willis said that taking the bronze was "incredibly satisfying...it's the personal satisfaction that we corrected all the wrongs from London.