West Yorkshire Fire and Rescue Service was called to a domestic property fire in Cowpasture Road, Ilkley, at 08.34 hrs today.
Five fire engines from Otley, Silsden, Rawdon, Bingley and Keighley stations attended as well as an aerial appliance from Bradford.
Attending fire crews quickly extinguished the fire but despite their best efforts an 89-year-old woman sadly passed away at the property.
Bradford District Commander Benjy Bush said: “We extend our deepest condolences to the lady’s friends and family at this difficult time.
“Enquiries are continuing and we have a specialist fire investigation officer onsite today to establish the circumstances of the fire.
“It is likely that firefighters will also remain onsite for the rest of this afternoon.”