**Exhibit 31.1**CERTIFICATIONI, Arthur L. Regan, certify that:1. I have reviewed this Quarterly Report on Form 10-Q for the quarter endedJune 30, 2007 of Arlington Tankers, Ltd.;2. Based on my knowledge, this report does not contain any untrue statementof a material fact or omit to state a material fact necessary to make the statements made, in lightof the circumstances under which such statements were made, not misleading with respect to theperiod covered by this report;3. Based on my knowledge, the financial statements, and other financialinformation included in this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, and for, the periodspresented in this report;4. The registrant’s other certifying officer and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange ActRules 13a-15(f) and 15d-15(f)) for the registrant and have:(a) Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure that material informationrelating to the registrant, including its consolidated subsidiaries, is made known to us by otherswithin those entities, particularly during the period in which this report is being prepared;(b) Designed such internal control over financial reporting, or caused suchinternal control over financial reporting to be designed under our supervision, to providereasonable assurance regarding the reliability of financial reporting and the preparation offinancial statements for external purposes in accordance with generally accepted accountingprinciples;(c) Evaluated the effectiveness of the registrant’s disclosure controls andprocedures and presented in this report our conclusions about the effectiveness of the disclosurecontrols and procedures, as of the end of the period covered by this report based on suchevaluation; and(d) Disclosed in this report any change in the registrant’s internal control overfinancial reporting that occurred during the registrant’s most recent fiscal quarter (theregistrant’s fourth fiscal quarter in the case of an annual report) that has materially affected,or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;and5. The registrant’s other certifying officer(s) and I have disclosed, basedon our most recent evaluation of internal control over financial reporting, to the registrant’sauditors and the audit committee of the registrant’s board of directors (or persons performing theequivalent functions):(a) All significant deficiencies and material weaknesses in the design oroperation of internal control over financial reporting which are reasonably likely to adverselyaffect the registrant’s ability to record, process, summarize and report financial information; and(b) Any fraud, whether or not material, that involves management or otheremployees who have a significant role in the registrant’s internal control over financialreporting.                                                /s/ ARTHUR L. REGAN   Name:  Arthur L. Regan  Date:  August 9, 2007 Title:  President and Co-Chief Executive Officer  
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