There is no federal law requiring most private employers to provide paid sick leave. Federal contractors are covered under a separate executive order, and the Family and Medical Leave Act gives eligible workers unpaid, job-protected leave.
Paid sick leave in the U.S.
Good to know
Paid sick leave and paid vacation are different things. This page covers sick leave. For whether unused vacation must be paid when you leave a job, see PTO payout rules. This is general information, not legal advice.