Background Hypertriglyceridemia (HTG) is one of the major modifiable risk factors for the development of several metabolic diseases. Determining the factors associated with HTG is an important step for increasing awareness of the problem and proper planning of health programs for HTG prevention. This study aimed to determine the conditions associated with HTG in adult patients in Basrah, Iraq. Methodology This retrospective study was conducted at Faiha Specialized Diabetes Endocrine and Metabolism Center (FDEMC) in Basra, southern Iraq, in January 2024. The data were retrieved from the center database of 37,133 subjects registered from 2008 to 2023 (16,284, 43.8% males and 20,849, 56.2% females) who attended the FDEMC in Basra due to different reasons. Results The most common causes of HTG were type 2 diabetes mellitus (T2DM) (29,799, 80%), obesity (19,914, 53.63%), and smoking (7,309, 12.68%). The age group of 18-45 years displayed higher triglyceride (TG) levels (281.1 ± 210.1 mg/dL) than other age groups. Furthermore, male patients had higher TG levels than females (288.0 ± 196.3 mg/dL vs. 268.9 ± 165.9 mg/dL). Regarding body mass index, overweight and obese patients had higher mean TG levels (284.4 ± 182.1 mg/dL and 281.7 ± 184.6 mg/dL, respectively). Current and ex-smokers had higher TG levels (305.1 ± 212.2 mg/dL and 283.4 ± 161.3 mg/dL, respectively) than non-smokers (272.5 ± 175.4 mg/dL). Moderate HTG was the most common category encountered in 24,137 patients (65%), followed by mild HTG (12,705, 34.2%). Very few patients had severe (264, 7%) or very severe HTG (27, 0.07%). Male patients had more frequent severe and very severe HTG than females. Conclusions The most common conditions associated with HTG were T2DM, obesity, and smoking. Smoker males were prone to severe and very severe HTG.