Objective: To evaluate the role of peak atrial longitudinal strain (PALS) through speckle tracking 2D echocardiography for the assessment of structural and functional left atrial (LA) remodelling in a type 2 diabetes mellitus (T2DM) population. Methodology: We conducted a cross-sectional study during a 9-month period. Were included T2DM adults aged 18 and above. The variables assessed during the study include age and gender of participants, diabetes characteristics, cardiovascular risk factors, clinical anthropometric and haemodynamic parameters, standard echocardiographic parameters, volume-derived LA functions and 2D PALS. Results: We included a total of 102 patients. The mean age was 58±11.7 years and the M/F sex ratio was 1:1.5. Coexistent arterial hypertension (HTN) was observed in more than half (59.8%) of the population sample. Mean 2D PALS was 29.2±8.9% with 58.8% (95% CI:50.0–68.6) of subjects having a reduced LA strain (i.e.<32%). Reservoir and pump functions were the most altered LA volumetric phasic functions. Mean indexed LA maximal volume was 22.2±6.8 ml/m². There was a significant association between abnormal PALS and age, Body mass index (BMI), indexed LA volume, E/E’ ratio, LA active ejection fraction (pump function) and LA expansion index (reservoir function). Conclusion: LA remodelling is a recurrent condition in adult T2DM Cameroonians. The Reservoir and pump LA functions were the most affected. Assessment of LA global strain allows early detection of LA remodelling with comparison to LA size standard analyses. Age, BMI, indexed LA volume, E/E’ ratio, reservoir and pump LA functions were associated to 2D LA global strain impairment.