Trustee is a legal term for a holder of property on behalf of a beneficiary. Trustee, trusty, trustees, trustee system, trusty system, and related terms and phrases containing the homophones "trustee" or "trusty" or the plural forms of these two words, refer to a very wide variety of disparate concepts:

• Board of directors/Board of trustees/trustee-in-trust 
• Trusty system (prison) (also known as "trustee system") (also listed under "trusty shooter")
• Trustee model of representation
• Trusteeism, a Roman Catholic parish administration system used in the United States
• Trusty (band)
• Consolidated PT-1 Trusty, an airplane