Pierre Garcon just touched down in Haiti on Redskins owner Daniel Snyder's jet ... carrying a bunch of medical supplies for people affected by the brutal hurricane last week.
TMZ Sports talked to Garcon Sunday night ... who told us, "I'm headed to Haiti tomorrow. Our owner is flying me and Ricky [Jean Francois] down to pass out medical supplies."
Garcon and Jean Francois are both of Haitian descent.
FYI -- Hurricane Matthew devastated the country -- killing over 950 people -- and injuring countless others.
Garcon and Jean Francois aren't the only athletes helping in Haiti ... boxer Andre Berto tells us he just arrived in the country with canned goods in tow.