EXHIBIT 31 - CERTIFICATIONS

CERTIFICATION

|I,   A.L. Giannopoulos, certify that:                                                                                                                                                                                                                                                                                                                    
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|1.        I   have reviewed this Annual Report on Form 10-K of MICROS Systems, Inc. (the   Registrant);                                                                                                                                                                                                                                                
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|2.        Based   on my knowledge, this report does not contain any untrue statement of a   material fact or omit to state a material fact necessary to make the   statements made, in light of the circumstances under which such statements   were made, not misleading with respect to the period covered by this report;                             
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|3.        Based   on my knowledge, the financial statements, and other financial information   included in this report, fairly present in all material respects the   financial condition, results of operations and cash flows of the Registrant   as of, and for, the periods presented in this report;                                                
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|4.        The   Registrants other certifying officers and I are responsible for establishing   and maintaining disclosure controls and procedures (as defined in Exchange   Act Rules 13a-15 and 15d-15(e)) and internal control over financial reporting   (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant   and we have:
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|5.        The   Registrants other certifying officers and I have disclosed, based on our   most recent evaluation of internal control over financial reporting, to the   Registrants auditors and the audit committee of Registrants board of   directors (or persons performing the equivalent function):                                            
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|Date: September 13, 2006 | /s/ A.L. Giannopoulos  
|------------------------ | -----------------------
|                         |                        
|                         | A.L. Giannopoulos      
|                         | Chairman, President and
|                         | Chief Executive Officer

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CERTIFICATION

|I,   Gary C. Kaufman, certify that:                                                                                                                                                                                                                                                                                                                      
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|1.        I   have reviewed this Annual Report on Form 10-K of MICROS Systems, Inc. (the   Registrant);                                                                                                                                                                                                                                                
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|2.        Based   on my knowledge, this report does not contain any untrue statement of a   material fact or omit to state a material fact necessary to make the   statements made, in light of the circumstances under which such statements   were made, not misleading with respect to the period covered by this report;                             
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|3.        Based   on my knowledge, the financial statements, and other financial information   included in this report, fairly present in all material respects the   financial condition, results of operations and cash flows of the Registrant   as of, and for, the periods presented in this report;                                                
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|4.        The   Registrants other certifying officers and I are responsible for establishing   and maintaining disclosure controls and procedures (as defined in Exchange   Act Rules 13a-15 and 15d-15(e)) and internal control over financial reporting   (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant   and we have:
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|5.        The   Registrants other certifying officers and I have disclosed, based on our   most recent evaluation of internal control over financial reporting, to the   Registrants auditors and the audit committee of Registrants board of   directors (or persons performing the equivalent function):                                            
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|Date: September 13, 2006 | /s/ Gary C. Kaufman        
|------------------------ | ---------------------------
|                         |                            
|                         | Gary C. Kaufman            
|                         | Executive Vice President,  
|                         | Finance and Administration,
|                         | and Chief Financial Officer

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