Introduction: The Alternative Healthy Eating Index (AHEI) and Dietary Approaches to Stop Hypertension (DASH) diets are associated with improved cardiovascular outcomes. We assessed associations between adherence to these diets and measures of left ventricular (LV) structure and function from the Echocardiographic Study of Latinos (Echo-SOL) ancillary study. Hypothesis: We hypothesized that increased adherence to AHEI or DASH diets would be associated with better cardiac structure and function. Methods: Cross-sectional baseline data from two 24-hour dietary recalls were used to calculate AHEI and DASH adherence scores among 1818 adults (57% female, mean age 56 ± 0.17) with complete echocardiographic assessments. Adherence scores were calculated based on decile of each food group for each score, with higher scores signifying higher adherence (AHEI: 0-110, DASH: 0-80). Associations between adherence scores and echo outcomes were analyzed via simple linear regression as well as ANOVA across quintiles of each score. All analyses were weighted to account for complex survey design. Results: Mean ± SE diet scores were 49.9 ± 0.32 for AHEI and 43.2 ± 0.33 for DASH. Higher AHEI scores were associated with better ejection fraction (EF) (1.1% per 10-point increase, p < 0.01) and higher left atrial volume index (1.6 ml/m 2 per 10-point increase, p < 0.01). Higher DASH scores were directly associated with EF (0.3% per 10-point increase, p < 0.01) and inversely associated with LV mass (-4.4g per 10-point increase, p < 0.01). In quintile analysis, better global longitudinal strain was seen across increasing quintiles of AHEI score (Figure). Conclusions: Adherence to AHEI and DASH diets was associated with more favorable cardiac structure and function. Pre-heart failure (HF) is an independent risk factor for incident clinical HF development. These findings have important implications for HF prevention.