Kathryn (Kate) Holmquist has been missing from her home at Lower Albert Rd, Sandycove, since 6 o'clock on Saturday evening.
The 62-year-old Irish Times journalist is described as being 5 foot 6 inches in height with brown eyes.
Kathryn's family are concerned for her welfare and anyone with information on her whereabouts is asked to contact Gardaí.
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Anyone with information on her whereabouts are asked to contact Gardaí at Dun Laoghaire on 01-666 5000, the Garda Confidential Line 1800 666 111 or any Garda Station.