Poland transported antiseptics, protective masks and medicine to Belarus, which reached the country's Grodno region and its capital, Minsk, on Friday.
The aid was delivered to Belarus by Polish firemen.
Commenting on the Polish aid action, Poland's ambassador to Belarus Artur Michalski said that "a friend in need, is a friend indeed."
Mr Michalski said both Poland and Belarus faced difficulties in the wake of the coronavirus epidemic, and stressed that Poland's policy was to share what it could with its neighbours in times of crisis.
"It's solidarity that is manifested in difficult times," Artur Michalski said.
Belarusian Deputy Health Minister Boris Andrasyuk thanked Poland for the aid, and called it "a good-neighbourly gesture and a token of solidarity."