Background: High body mass index (BMI) is a risk factor for type 2 diabetes and cardiovascular disease. However, its relationships with indices of carotid stiffness and plaque volume are unclear. We investigated associations of long-term measurements of BMI with indices of carotid stiffness and atherosclerosis among non-demented diabetes patients from the Israel Diabetes and Cognitive Decline (IDCD) study. Methods: Carotid ultrasound indices [carotid intima media thickness (cIMT), distensibility, elastography and plaque volume] were assessed in N=471 participants. Mean BMI across all MHS diabetes registry measurements and trajectories of BMI were calculated. BMI was categorized into three trajectory groups representing: a relatively stable normal weight (n=185, 44%), overweight trajectory (n=188, 44.8%) and a trajectory of obesity (n=47, 11.2%). Linear and logistic regressions estimated associations of carotid indices with mean BMI and BMI trajectories. Results: Compared to the normal weight trajectory, an obesity trajectory was associated with carotid distensibility (β=-3.078, p=0.037), cIMT (β=0.095, p=0.004), and carotid elastography (β=0.181, p=0.004) but not with plaque volume (β=0.066, p=0.858). Compared with the normal weight trajectory, an obesity trajectory was associated with increased odds for impaired carotid distensibility (OR=2.790, p=0.033), impaired cIMT (OR=5.277, p=0.001) and large carotid plaque volume (OR=8.456, p=0.013) but not with carotid elastography (OR=1.956, p=0.140). Mean BMI was linearly associated with Distensibility (β=-0.275, p=0.005) and cIMT (β=0.005, p=0.026).Conclusions: Long-term measurements of adiposity are associated with indices of carotid stiffness and plaque volume among older type 2 diabetes adults.