She was last seen on Friday.
Gardaí are appealing for the public’s assistance in tracing the whereabouts of 22-year-old from the midlands.
Realtín O’Brien has been missing from Westmeath since Friday.
The Mullingar woman is described as being approximately 5’ 7” in height, of slim build, with blonde hair.
When last seen she was wearing a black jacket, black leggings and white trainers.
Gardaí and Realtín’s family are concerned for her welfare.
Anyone with information on Realtin’s whereabouts are asked to contact Mullingar Garda Station on 044 938 4000, the Garda Confidential Line on 1800 666 111, or any Garda Station.