| ATM | Amateur Telescope Maker | - | Atmospheric Research Center |
| ATM | Apollo Telescope Mount (on Skylab) | - | Atmospheric Research Center |
| ATM | Automated Teller Machine | - | Chatting Acronyms |
| ATM | Aerosol Trajectory Model | - | Computer Acronyms(common) |
| ATM | Airborne Thematic Mapper | - | Computer Acronyms(common) |
| ATM | Asynchronous Transfer Mode | - | Computer Acronyms(common) |
| ATM | Analytic Tetrahedron Method (for Brillouin-zone Integrals And Electron Spin Densities) | - | Computer Acronyms(common) |
| ATM | Asynchronous Transfer Mode | - | Computer and Internet |
| ATM | Asynchronous Transfer Mode | - | Human Genome |
| ATM | At The Moment | - | Sms Text Smileys and Emoticons |
| ATM | Automated Teller Machine - Asynchronous Transfer Mode - At The Moment | - | Astronomy |
| ATM | Apollo Telescope Mount | - | Business and Finance |
| ATM | Division Of Atmospheric Sciences | - | Business and Finance |
| ATM | Adobe Type Manager | - | Business and Finance |
| ATM | Asynchronous Transfer Mode | - | Business and Finance |
