To　achieve　a　design　with　the　desired　stiffness,　strength,　and　durability　at　the　component　level,　topology　optimization　has　been　practiced　and　was　effective　in　the　design　of　sustainable　products,　by　autumnally　allocating　the　available　material　within　the　design　domain　to　form　the　shortest　loading　path.　In　the　conceptual　phase,　this　paper　proposed　a　design　methodology　using　topology　optimization　technique　for　lightweight　design　of　a　tripod　structure　-　a　typical　form　of　foundation　for　offshore　wind　turbines　(OWTs).　The　minimum　compliance　subject　to　prescribed　volume　percentage　is　formulated　and　an　innovative　tripod　structure　is　generated　by　interoperating　the　optimized　structure.　To　facilitate　comparison,　a　tripod　structure　of　a　5　MW　OWT　is　referenced.　The　system　performances　are　comprehensively　and　synthetically　assessed,　encompassing　the　natural　frequency,　maximum　von　Mises　stress　in　ultimate　load　cases　and　cumulative　fatigue　damage.　It　is　discovered　that　the　total　mass　of　the　novel　design　is　substantially　less　than　that　of　the　reference　structure.　In　contrast,　the　fatigue　resistance　has　been　significantly　enhanced.　These　finding　reveal　conclusively　that　the　proposed　topology　optimization　approach　is　capable　of　generating　novel　designs,　reducing　weight　and　alleviating　fatigue　damage.　©　2023