Representatives from the oil and gas industry joined relatives and friends at a ceremony in Aberdeen city centre this afternoon.
Four oil workers died when their Super Puma helicopter plunged into the sea off Shetland on August 23.
Duncan Munro, 46, from Bishop Auckland in County Durham, and 57-year-old George Allison from Winchester, Hampshire, were killed as they returned from the Borgsten Dolphin support vessel.
The crash en route to Sumburgh Airport also claimed the lives of 45-year-old Sarah Darnley from Elgin, Moray, and Gary McCrossan, 59, from Inverness.
They were remembered during a 50-minute gathering at St Nicholas Kirk led by Reverend Gordon Craig.
A kirk official said the church was "well-filled" for the service, an annual ceremony which this year saw the introduction of a new Book of Remembrance to mark the 25th anniversary year of the Piper Alpha disaster.
Three other oil industry workers who died in the last 12 months were also remembered.
An investigation into the crash is continuing. The Air Accidents Investigation Branch (AAIB) says it has found no evidence of technical failure in the helicopter, which was carrying 16 passengers and two crew.
Survivor James Nugent has demanded answers over the crash which has halted his offshore career.
The 41-year-old, who lives in Newquay, suffered a spinal injury.
He said on Friday: ''There is obviously a need to fully understand what happened in this awful incident.
''It was so tragic and simply no-one deserves to die whilst being transported home from work. Like myself, we all just wanted to get home to our families after a long time working offshore.
''The accident has destroyed my short-lived career working offshore and the same for others that were also in the accident.
''I just want answers over what has happened and for someone to take responsibility for the fact that 16 passengers and two pilots were in a horrific aviation accident that should never have happened.''