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.　©　2024　Elsevier　Inc.