  The Cygnus OB2 Association is one of the nearest and largest collections of
massive stars in the Galaxy. Situated at the heart of the "Cygnus X" complex of
star-forming regions and molecular clouds, its distance has proven elusive
owing to the ambiguous nature of kinematic distances along this $\ell\simeq80$
degree sightline and the heavy, patchy extinction. In an effort to refine the
three-dimensional geometry of key Cygnus~X constituents, we have measured
distances to four eclipsing double-lined OB-type spectroscopic binaries that
are probable members of Cyg~OB2. We find distances of $1.33\pm0.17$,
$1.32\pm0.07$, $1.44\pm0.18$, and $1.32\pm0.13$ kpc toward MT91~372, MT91~696,
CPR2002~A36, and Schulte~3 respectively. We adopt a weighted average distance
of 1.33$\pm$0.06~kpc. This agrees well with spectrophotometric estimates for
the Association as a whole and with parallax measurements of protostellar
masers in the surrounding interstellar clouds, thereby linking the ongoing star
formation in these clouds with Cyg~OB2. We also identify Schulte 3C (O9.5V), a
4" visual companion to the 4.75 day binary Schulte~3(A+B), as a previously
unrecognized Association member.
