Exhibit12.1

CERTIFICATIONS

I, Dan Sten Olsson, certifythat:

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| 1.  | I have reviewed this annual report onForm 20-F of Stena AB (publ) (the"Company"); |

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| 2.  | Basedon my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make thestatements made, in light of the circumstances under which suchstatements were made, not misleading with respect to the period coveredby this report; |

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| 3.  | Based on my knowledge, thefinancial statements, and other financial information included in thisreport, fairly present in all material respects the financialcondition, results of operations and cash flows of the Company as of,and for, the periods presented in thisreport; |

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| 4.  | The Company's other certifyingofficer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules13a-15(e) and 15d-15(e)) for the Company andhave: |

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|  | (a)  | Designed such disclosurecontrols and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure thatmaterial information relating to the Company, including itsconsolidated subsidiaries, is made known to us by others within thoseentities, particularly during the period in which this report is beingprepared; |

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|  | (b)  | Evaluated theeffectiveness of the Company's disclosure controls and proceduresand presented in this report our conclusions about the effectiveness ofthe disclosure controls and procedures, as of the end of the periodcovered by this report based on suchevaluation; |

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|  | (c)  | Disclosed in thisreport any changes in the Company's internal control overfinancial reporting that occurred during the period covered by theannual report that has materially affected, or is reasonably likely tomaterially affect, the Company's internal control over financialreporting; and |

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| 5.  | The Company's othercertifying officer and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to theCompany's auditors and the audit committee of the Company'sboard of directors (or persons performing the equivalentfunctions): |

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|  | (a)  | All significantdeficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likelyto adversely affect the Company's ability to record, process,summarize and report financial information; and |

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|  | (b)  | Any fraud, whether or not material,that involves management or other employees who have a significant rolein the Company's internal control over financialreporting. |

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|                         Date:June 22, 2005 |  | /s/ Dan StenOlsson                         Name: DanSten Olsson      Title: Chief ExecutiveOfficer |
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