For a completely regular
ordered space X, the Stone-Čech order compactiflcation β1(X) has been constructed
by Nachbin. This compactification is a generalized concept of the ordinary
Stone-Čech compactiflcation β(X) in the sense that if X has the discrete order:
x ≦ y iff x = y, then β1X = βX. In this paper, for a convex ordered space X with a
semi-closed order, the Wallman order compactification ω0(X) is constructed by the
use of the concept of maximal bifilters. ω0(X) is a T1-compact ordered topological
space in which X is densely embedded in both the topological and order
sense.