  In this paper, we define Mannheim partner curves in a three dimensional Lie
group G with a bi-invariant metric. And then the main result in this paper is
given as (Theorem 3.3): A curve {\alpha} with the Frenet apparatus
{T,N,B,{\kappa},{\tau}} in G is a Mannheim partner curve if and only if
{\lambda}{\kappa}(1+H2)=1, where {\lambda} is constant and H is the harmonic
curvature function of the curve {\alpha}.
