BackgroundMetabolic syndrome (MS) among people living with HIV (PLHIVs) is a global public health issue. However, there is no primary data about predictors of MS in the SSA and Ethiopia. Therefore, the aim of this study was to determine predictors of MS, among PLHIVs in the Gedeo-Zone,Southern-Ethiopia.MethodsUnmatched case-control study approach, among PLHIVs who served at randomly chosen two hospitals and health centers in the zone, in between (December 29th-2017 and January 22nd-2019) was done. WHO-steps tools were used to gather the data, finally handled with (Epidata-V-3.1 and SPSS-V-22) software’s. Lastly, using a multivariable conditional-LR-model, 4-models with AOR (95%CI) were computed to arrived at the final model, and then variables accepted as significant at (p-value < 0.05)level. ResultOverall, 633 PLHIVs (139 cases and 494 controls) were included in the analysis. The leading factors associated with MS were Age(>/=45years-old)(AOR=4.0,95%CI: 1.4-11.9), completed secondary school education (AOR=0.1,95% CI:0.01-0.5), un-employed(a home-maker AOR=0.1,95%CI:0.03-0.7 vs able to work AOR=0.1,95%CI:0.06-0.5)),Antiretroviral-therapy-exposed(AOR=0.1,95%CI:1.0-8.5),WHO-stage(>/=III)(AOR=4.4,95% CI:1.4-13.4), total physically activity (AOR=0.1,95% CI:0.04- 0.35), history of blood sugar measured (AOR=10.7,95%CI:3.3-34.6), elevated waist-circumference(AOR=6.9,95%CI:2.5-18.7),raised body mass index(AOR=5.4 95% CI: 1.6,18.4),fasting-glucose(AOR=29.3,95%CI:10.0-85.4),raisedtriglyceride(AOR=4.8,95%CI:2.0-11.3), and low high density lipoprotein(AOR=12.3 95% CI: 5.2,29.3). ConclusionThe finding implicated, the significance of planning intervention actions that targets the above factors in to account.