The city's Lord Provost Sadie Docherty lay a wreath at Dalbeth Cemetery in honour of five Glasgow Auxiliary Fire Service messenger boys.
They died at the height of the German bombing on 13 and 14 March 1941.
The boys were among 90 youngsters who cycled or ran with potentially lifesaving messages for front-line fire crews during the war.
The lord provost laid the wreath in honour of all the messenger boys who died at a Celtic Cross which was erected at the grave of 15-year-old Neil Leitch.
He died from bomb injuries sustained while trying to take a communication to Partick Fire Station.
The teenager had been injured during an earlier mission when he was blown off his bicycle by a bomb.
He defied orders to rest and continued with his duties until he was fatally injured.
The lord provost said: "I am proud to join others to remember the remarkable, and little known, bravery of Neil Leitch and all the other Fire Service volunteer boy cyclists across the country, who put their lives on the line to save others during the Second World War.
"Sadly Neil Leitch along with four others paid the ultimate price that terrible night as our city and its citizens were relentlessly bombed."
Following his death, Neil Leitch was gazetted by King George VI for his bravery and devotion to duty.
His nephew James Leitch, a former Clydebank fireman who now lives in Orkney, attended the service along with family from across the UK.
James said: "I grew up hearing about my uncle Neil and this is something we have always wanted to do.
"These boys were forgotten. To me they deserve recognition. It will be an emotional day."
The lord provost was joined by George McGrandles, of the Scottish Fire and Rescue Service, the city's senior fire officer.
He formed part of a Fire and Rescue Service Guard of Honour in tribute to the youngsters.
"The role of the boy messengers isn't widely known but it was absolutely vital," he said.
"They took on an incredibly dangerous role to ensure fire crews could get to where they were needed even when bombs destroyed communications channels.
"It took incredible courage and, in trying to save others, these five youngsters ultimately lost their lives."

An Â£8m scheme has been unveiled for the home, where Lennon played as a child.
The venture will combine an education centre for young people with learning difficulties and an exhibition on the home, the song and Lennon's early life.
The gates at the site, which is closed to the public, are a popular attraction for Beatles fans visiting Liverpool.
The plans were announced on the 50th anniversary of the release of the single, which was a double-A side with Penny Lane, reaching number two in the UK charts and number eight on the Billboard Hot 100 chart in the USA.
The original home in Woolton was demolished in the early 1970s and replaced with a smaller building.
Major Drew McCombe, divisional leader for the North West branch of the charity, said: "Strawberry Field is special in the hearts of many people in Liverpool, the UK and across the world, and we at the Salvation Army are aiming to redevelop the site to do justice to the many people that have been supported by the children's home or formed a connection with the iconic Beatles song."
According to Blue Badge Beatles tour guide Neil McDonald, the gates are one of the must-see Beatles sights in the city.
He said: "It is a unique atmosphere. I've seen some people burst into tears and even proposals of marriage."
According to Hunter Davies's biography of The Beatles, one of Lennon's childhood treats was the garden party that took place each summer on the grounds of Strawberry Field.
His Aunt Mimi recalled: "As soon as we could hear the Salvation Army band starting, John would jump up and down shouting 'Mimi, come on. We're going to be late.'"
The musician is said to have found a place of peace and refuge from his troubled childhood in the woods around the home, where he went to play with friends, climb trees and dream the hours away.
The song's refrain "and nothing to get hung about" is said to be a reference to Lennon's retort "they can't hang you for it" to Mimi about playing on the property.
Official fundraising for the project begins later this year.
A service has been held in Glasgow to honour young messenger boys who died in air raids during Word War Two.
[NEXT_CONCEPT]
The children's home immortalised by John Lennon in The Beatles hit Strawberry Fields Forever is to be redeveloped by the Salvation Army.