Wooden building block (100, 100') for realizing walls, comprising: - two plate-shaped exterior-wall elements (1a, 1b) with an essentially rectangular cross-section (Q 10), and - at least one plate-shaped interior-wall element (2, 2a, 2b, 2c) arranged between the two exterior-wall elements (1a, 1b) with an essentially rectangular cross-section (Q 11), wherein the at least one interior-wall element (2, 2a, 2b, 2c) is designed and arranged relative to the two exterior-wall elements (1a, 1b) in such a way that a) a first longitudinal side and a first transverse side of the interior-wall element (2, 2a, 2b, 2c) project with relation to the two exterior-wall elements (1a, 1b) and each form one or a plurality of tongues (4, 4a, 4b, 4c, 4', 4a', 4b', 4c'), wherein at least one second longitudinal side or a second transverse side of the interior-wall element (2, 2a, 2b, 2c) is recessed with relation to the two exterior-wall elements (1a, 1b) and forms one or a plurality of grooves (5, 5a, 5b, 5c, 5', 5a', 5b', 5c'), or b) one first longitudinal side and one first transverse side of the interior-wall element (2, 2a, 2b, 2c) are each recessed with relation to the two exterior-wall elements (1a, 1b) and each form one or a plurality of grooves (5, 5a, 5b, 5c, 5', 5a', 5b', 5c'), wherein at least one second longitudinal side or a second transverse side of the interior-wall element (2, 2a, 2b, 2c) projects with relation to the two exterior-wall elements (1a, 1b) and each forms one or a plurality of tongues (4, 4a, 4b, 4c, 4', 4a', 4b', 4c'), characterized in that at least one interior-wall element (2, 2a, 2b, 2c) and/or the exterior-wall elements (1a, 1b) are segmented in segments (6a, 6b, 6c, 6d), wherein the wooden building block (100, 100') extends in a longitudinal direction, and the segments (6a, 6b, 6c, 6d) are arranged in the longitudinal direction adjacent to one another. - two plate-shaped exterior-wall elements (1a, 1b) with an essentially rectangular cross-section (Q 10), and - at least one plate-shaped interior-wall element (2, 2a, 2b, 2c) arranged between the two exterior-wall elements (1a, 1b) with an essentially rectangular cross-section (Q 11), wherein the at least one interior-wall element (2, 2a, 2b, 2c) is designed and arranged relative to the two exterior-wall elements (1a, 1b) in such a way that a) a first longitudinal side and a first transverse side of the interior-wall element (2, 2a, 2b, 2c) project with relation to the two exterior-wall elements (1a, 1b) and each form one or a plurality of tongues (4, 4a, 4b, 4c, 4', 4a', 4b', 4c'), wherein at least one second longitudinal side or a second transverse side of the interior-wall element (2, 2a, 2b, 2c) is recessed with relation to the two exterior-wall elements (1a, 1b) and forms one or a plurality of grooves (5, 5a, 5b, 5c, 5', 5a', 5b', 5c'), or b) one first longitudinal side and one first transverse side of the interior-wall element (2, 2a, 2b, 2c) are each recessed with relation to the two exterior-wall elements (1a, 1b) and each form one or a plurality of grooves (5, 5a, 5b, 5c, 5', 5a', 5b', 5c'), wherein at least one second longitudinal side or a second transverse side of the interior-wall element (2, 2a, 2b, 2c) projects with relation to the two exterior-wall elements (1a, 1b) and each forms one or a plurality of tongues (4, 4a, 4b, 4c, 4', 4a', 4b', 4c'), a) a first longitudinal side and a first transverse side of the interior-wall element (2, 2a, 2b, 2c) project with relation to the two exterior-wall elements (1a, 1b) and each form one or a plurality of tongues (4, 4a, 4b, 4c, 4', 4a', 4b', 4c'), wherein at least one second longitudinal side or a second transverse side of the interior-wall element (2, 2a, 2b, 2c) is recessed with relation to the two exterior-wall elements (1a, 1b) and forms one or a plurality of grooves (5, 5a, 5b, 5c, 5', 5a', 5b', 5c'), or b) one first longitudinal side and one first transverse side of the interior-wall element (2, 2a, 2b, 2c) are each recessed with relation to the two exterior-wall elements (1a, 1b) and each form one or a plurality of grooves (5, 5a, 5b, 5c, 5', 5a', 5b', 5c'), wherein at least one second longitudinal side or a second transverse side of the interior-wall element (2, 2a, 2b, 2c) projects with relation to the two exterior-wall elements (1a, 1b) and each forms one or a plurality of tongues (4, 4a, 4b, 4c, 4', 4a', 4b', 4c'), characterized in that at least one interior-wall element (2, 2a, 2b, 2c) and/or the exterior-wall elements (1a, 1b) are segmented in segments (6a, 6b, 6c, 6d), wherein the wooden building block (100, 100') extends in a longitudinal direction, and the segments (6a, 6b, 6c, 6d) are arranged in the longitudinal direction adjacent to one another.