Background: Attention and working memory functions have important roles in daily activities. Normal level of hemoglobin is required for optimum attention and working memory functions. This study aims to analyze the correlation between hemoglobin level, attention, and working memory scores in medical students who attended Atlas Medical Pioneer (AMP) Basic Program XXI. Methods: The total population sample for this cross-sectional study included 27 males and 19 females. The hemoglobin level was meassured by using cyanmethemoglobin method. Digit Symbol Test, Digit Span Forward and Backward Test, Trail Making Test A and B, and Stroop Test were used to assess attention and working memory scores. The study was conducted from September to November 2012 in Jatinangor campus of the