Thoy Sok, 34, was struck at about 2:30pm during an unseasonal dry-season storm, the National Police website said yesterday.
"She died in her rice field instantly," it said.
On Friday, two separate lightning strikes killed a woman and injured three, one critically, in Battambang province.
On March 12, a 44-year-old soldier was killed by lightning as he worked on a cassava farm in Preah Vihear province's Choam Khsant district.
Disaster management figures show that 213 people were struck by lightning last year in Cambodia, 108 of whom were killed - up from 107 deaths in 2015.
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