• Search job boards like LinkedIn or Glassdoor for results that include something like “cyber” or “security,” plus something like “internship” or “analyst.”
• Try to get paid instead of working for free, if possible.
• Review what to look for in a job or internship.
• See also: Scholarships.

Some places to start:

• Public Sector (US-focused): NSA, White House ONCD, CIA, FBI, DoD, DHS, CISA, CCIPs
• Private Sector: Company Infosec Teams, Cyber Nonprofits, Threat Intelligence Companies, Cybersecurity Software Companies
• Research: University research centers, writers, think tanks