Gasnier was included on the National Rugby League's list of 100 greatest players and the honorary Team of the Century.
[4] Gasnier was selected in the NSW schoolboys side aged 13, to play in a curtain raiser to the 1952 Australia and New Zealand Test.
"[6] Upon Gasnier's retirement then ARL chairman Bill Buckley said, "[In] his day, he was the greatest rugby league player I have ever seen.
[6][7] In 1957, Gasnier, aged 18, focused his attention on rugby league, signing with the local St. George Dragons for the 1958 season.
On the tour, he scored a hat trick in the 1st Test 22–14 victory against Great Britain at Swinton's Station Road (attendance 35,224).
He later told in an interview that he never regretted his decision to retire, explaining that he had been playing rugby league virtually non-stop including juniors, junior representative games, the Sydney premiership, interstate games and international tours since the early 1950s, and felt it was about time that he started devoting more time to his family.
[3] After retiring from the playing field in 1967, Gasnier was involved in the media side of rugby league, becoming a sports writer and broadcaster.
[15] In 1981, Gasnier was selected as one of the initial four post-war "Immortals" of the Australian game along with Clive Churchill, Johnny Raper and Bob Fulton.
[23][24][25] Gasnier was also named as one of the centres, along with Mal Meninga, in Australian rugby league's 17 player Team of the Century in April 2008.
[26] Gasnier was made a life member of the Sydney Cricket Ground, and a plaque in the Walk of Honour there commemorates his career.
[9] In 2010, a bronze statue of Gasnier was unveiled as the seventh at the grounds as part of the Basil Sellers Sports Sculpture project.
[28] A tribute to the life of Reg Gasnier was held at Jubilee Oval, Kogarah on 5 July 2014 and was attended by over 12,000 people.
Many of his former team-mates attended the hour long ceremony including three Immortals; Graeme Langlands, Wally Lewis and Johnny Raper.
A plaque is erected near the north western sideline of Jubilee Oval where Gasnier showed his electrifying skill and talent during his sparkling rugby league career.
[29] On 20 July 2022, Gasnier was named in the St. George Dragons District Rugby League Clubs team of the century at centre.