Gemma Hudson, 40, was last seen just before 5.30pm yesterday, when she was said to have been in the Braithwaite area of Keighley.
A West Yorkshire Police spokesperson said: “Officers are appealing for anyone who may have seen Gemma around that time or since to contact us.”
West Yorkshire Police said she was white, 5ft 2in tall and had dark brown hair. It is unknown what she is wearing.
Anyone with information about her whereabouts should contact West Yorkshire Police using the live chat feature on their website or by calling 101 quoting log 1230 of 17 January Please.