不是，ibond有social security number才能买，所以是仅对美国居民发售的。

In a calendar year, one Social Security Number or one Employer Identification Number may buy: up to $10,000 in electronic I bonds, and. up to $5,000 in paper I bonds (with your tax refund)

https://www.treasurydirect.gov/savings-bonds/how-much-can-i-spend-own/