The dynamic midcourter, renowned for her high work ethic and never-say-die attitude, made her international debut against England in 2005 at just 18 years old.
Langman went on to set an enviable record of an incredible unbroken run of tests since her first appearance.
After an 18-month absence from the international game, she returned to captain the national side in 2018 and led the Silver Ferns to victory at the 2019 Netball World Cup in Liverpool.
"I am so grateful to have had a second chance with the Silver Ferns and to captain the team at the Netball World Cup. The memories from that campaign and win are epic and it was special to be able to bring the Netball World Cup back to New Zealand."
Langman also paid tribute to long-time coach and mentor, Dame Noeline Taurua, who guided her through her step up to elite netball.
"I was with Noels at the Magic as a teenager and she has played such an important part in my netball career," she said.
"She has been a mentor throughout and it was incredibly special to finish my time with the Silver Ferns with Noels at the helm."
Taurua, who also coached Langman at the Lightning, said the midcourter was one of the game's greats.
"I've known Laura since she was 15 years old and I have seen her grow as an athlete, netballer and as a person. It has certainly been an honour to be part of Lauz's life for so long. I am in debt for what she has given me personally, and how she has always been a supportive figure in my coaching career.
"She was fearless on court, set the bar with her work and training ethic and is a tough competitor who displays an iron will to win. She is well respected around the world and has been a marvellous servant of our sport.
"It was fitting to see her end her international career on top of the world championship podium, and to be standing there with her is something I will always cherish."
Netball New Zealand chief executive Jennie Wyllie said international netball was saying goodbye to a legend of the game.
"I want to thank Laura for her outstanding service and dedication to netball in New Zealand and congratulate her on what has been a truly remarkable international career," she said.
"We respect her decision to step down from the Silver Ferns and wish Laura well in her next adventure."
Langman attended four Netball World Cups (2007, 2011, 2015 and 2019) and three Commonwealth Games (2006, 2010 and 2014) and leaves the game with one world title and two Commonwealth gold medals. She also captained the New Zealand U-21 team to victory in the 2005 Netball World Youth Cup.
Domestically, she was part of the Waikato-BOP Magic side which won the transtasman league in 2012 as well as an Australian league title with the Lightning (2017).