We define and study a new oriented cohomology theory [Special characters omitted.] (-) defined on smooth complex varieties, called semi-topological cobordism. The construction combines the semitopological construction due to Friedlander-Walker together with motivic stable homotopy theory for smooth varieties. The semi-topological cobordism interpolates between the algebraic cobordism [Special characters omitted.] defined by Voevodsky in the motivic stable homotopy category, and the complex cobordism of the underlying analytic variety MU *(-). The algebraic cobordism and semi-topological cobordism agree with finite coefficients. On the other hand the semi-topological cobordism and the topological complex cobordism agree integrally for a point as well as certain classes of varieties such as smooth cellular varieties or smooth projective toric varieties.