TNA
- 2,4,6-Trinitroaniline
- Aritzia
- Jinan Yaoqiang International Airport
- La Liga Argentina de Básquet
- Mr. TNA (disambiguation)
- TNA (Airborne nuclear warhead)
- TNA Park
- Tacana language
- Tamil National Alliance
- Tashi Namgyal Academy
- Thane railway station
- The National Alliance
- The National Archives (United Kingdom)
- The New Age (South African newspaper)
- The New American
- Thornton Abbey railway station
- Threose nucleic acid
- Time and attendance
- Tonga Nurses' Association
- Total Nonstop Action Wrestling
- Training needs analysis
- Trans Nation Airways
- TransAsia Airways