Richard Dyson was last seen by his daughter, Bethany Dainty, on November 15 when he dropped her off in Aston, Rotherham.
Bethany said her relationship with her dad was close, and she became concerned when she didn’t hear from him for a week.
She reported 56-year-old Richard missing on November 25, and police confirmed that the last sighting of him was on November 17 when he was seen walking towards the A6135 Sheffield Road in Hoyland, near to Parkside Farm.
Bethany, now 20, said the past 12 months have been the toughest of her life and wants to urge anyone with any information to come forward.
“Waking up every day not knowing what has happened to my dad is like a bad dream that I can’t get away from.
“All I want to know is what happened. I am certain somebody, or maybe even more than one person, knows something that will help. I ask you directly, and from the bottom of my heart, please, please get in touch and tell somebody what you know. I don’t deserve to live like this, I just need some answers.”
Leading officer on the case, detective inspector Neil Coop said: “We are trying to determine what led up to his disappearance.
“We know that Richard is very close to his daughter and that it is very unusual for him to go for long periods of time without contacting her.
“Throughout the past year this young woman has had to mark Richard’s birthday, Father’s Day, Christmas, her own birthday and countless other important dates without her dad.
“I don’t want another Christmas to pass with her not knowing what has happened.
“I am keen to investigate every avenue. If you have any information, no matter how small, it could be the key we need to find Richard.
“Richard was known to spend time in the Elsecar and Hoyland areas of Barnsley. Please look at the photos of Richard and cast your mind back to this time last year. Did you see Richard? Did you have information that may help our investigation?
“It doesn’t matter how minor you think your contribution may be, we really do want to hear from you. What you know could be the key that unlocks this investigation and ultimately helps Bethany.”
Richard is described as being 5ft 10in, of slim build and with short, grey hair.
He was last seen wearing a navy Kappa jacket with white stitching.
If you have any information, phone 101 quoting incident number 459 of November 25, 2019 or call Crimestoppers on 0800 555 111.