Objectives:　This　study　aimed　to　investigate　the　association　between　albumin　corrected　anion　gap　(ACAG)　and　30-day　mortality　in　septic　older　adults.　Methods:　In　this　study,　multivariate　Cox　regression　models　and　Kaplan-Meier　analysis　were　employed　to　evaluate　the　correlation　between　ACAG　and　30-day　mortality　in　septic　older　adults.　Results:　After　adjustment　for　potential　confounders,　each　1　mmol/L　increase　in　ACAG　was　associated　with　a　6%　increase　in　30-day　mortality　(HR,　1.06　[1.03-1.08],　P　＜　0.001).　Higher　levels　of　ACAG　in　septic　older　adults　were　associated　with　lower　30-day　survival　rates　based　on　Kaplan-Meier　analysis.　Conclusions:　This　study　observed　a　significant　correlation　between　higher　ACAG　and　30-day　mortality　in　septic　older　adults,　thus　indicating　the　need　for　increased　attention　from　clinicians　for　patients　with　higher　ACAG　levels.　(c)　2024　Elsevier　Inc.　All　rights　are　reserved,　including　those　for　text　and　data　mining,　AI　training,　and　similar　technologies.