Tomas Walsh (born 1 March 1992) is a New Zealand athlete who competes mainly in the shot put. He is the current national record holder both outdoors and indoors for the event. His personal best of 22.90 m (75 ft 1+1⁄2 in), set in Doha, 5 October 2019, is also the Oceanian record and makes him the seventh best shot putter in history.

Walsh was the bronze medallist at the 2014 IAAF World Indoor Championships, the silver medallist at the 2014 Commonwealth Games, 4th at the 2015 World Championships in Athletics, winner of the 2016 IAAF World Indoor Championships, the bronze medallist at the 2016 Summer Olympics, the gold medallist at the 2017 World Championships and the bronze medallist at the 2019 World Championships, 2022 World Athletics Indoor Championships and the 2020 Summer Olympics, and gold medallist at the 2022 Commonwealth Games.

Walsh made his international debut at the 2009 World Youth Championships in Athletics, where he placed sixth in the shot put and also competed in the qualifying of the discus throw. On 12 December 2009 Walsh threw 20.21 m (66 ft 3+1⁄2 in) with the 5 kg shot to win the Senior Boys title at the New Zealand National Secondary School Track and Field Championships. This performance was a New Zealand Youth (Under 18) record, which was broken the following day by Jacko Gill when winning the Junior Boys (Under 16) title.

Walsh broke the New Zealand junior record on 18 March 2010 with a put of 18.82 m (61 ft 8+3⁄4 in) with the 6 kg shot but this was broken 9 days later by Gill with 19.92 m (65 ft 4+1⁄4 in). At the 2010 World Junior Championships in Athletics Walsh failed to qualify for the final of the shot put which was won by Gill.

In 2012 Walsh won his first senior national shot put title which he retained the following season and also added the discus title. On 12 December 2013 Walsh broke Gill's New Zealand senior shot put record with 20.61 m (67 ft 7+1⁄4 in) in Melbourne, Australia which he improved with 21.16 m (69 ft 5 in) on 22 March 2014, also in Melbourne.

At the 2014 IAAF World Indoor Championships, in his first senior international competition and first ever competition indoors, Walsh finished third in the men's shot put. He set an indoor national record of 20.41 m (66 ft 11+1⁄2 in) in the qualifying round and improved upon this mark three times in the final finishing with 21.26 m (69 ft 9 in) which was an Oceanian indoor record and the same distance as the Oceanian outdoor record.

Later in 2014, Walsh improved his outdoor personal best and the New Zealand record with 21.23 m (69 ft 7+3⁄4 in) at the 2014 IAAF Diamond League meet in Glasgow on 11 July, before improving again to 21.24 m (69 ft 8 in) on 27 July, during the qualifying round at the 2014 Commonwealth Games, which was a Commonwealth Games record. In the final, Walsh won the silver medal behind O'Dayne Richards.

In 2015, Walsh defended his New Zealand shot put title with a throw of 20.73 m (68 ft 0 in) on 8 March, before setting a new Oceanian record of 21.37 m (70 ft 1+1⁄4 in) on 21 March at the Melbourne Track Classic.