The objective of the research study performed was to assess the effect of oat flour, bran, and flakes on the baking value of rye-oat blends. The research material consisted of a commercial rye flour, type 720, oat flour, oat bran, and oat flakes. The oat flour and oat bran were produced by grinding commercial oat groats (hulled grains) in a Quadrumat Junior mill (Brabender) (the yield was, respectively: 44.5 and 55.5 %. The oat flakes were ground in a ‘WŻ-1’ laboratory grinder (product of Sadkiewicz Instruments). Blends were made of rye flour and oat products; the content of oat products therein was: 5, 10, 15, and 20 %. The control sample consisted of rye flour. The analysis performed comprised three series. The increased content of oat products in the rye-oat blend caused the falling number to increase. The blends containing oat flour had a slightly higher final temperature of gelatinization and a lower maximum viscosity of gruel than the blends with oat bran and flakes. Compared to the control sample, the 15 and 20% content of oat products caused the final gelatinization temperature to slightly increase and the maximum viscosity to decrease. The oat products, and, particularly bran, increased the resistance of dough to mechanical treatment. The higher the content of oat products was, the longer the dough kept its stability and became less softened. Rye- and rye-oat breads with the content of oat products up to 15% had a similar yield and volume. Their crumb was more elastic and characterized by a more homogenous porosity.