An infrared vibrational predissociation spectrum of the Br-79(-)-C2H2 anion complex has been recorded over the 2800-3400 cm(-1) range. Bands are observed that correspond to excitation of bound and free C-H stretches of an acetylene molecule engaged in a linear hydrogen bond with Br-. The band associated with the bound C-H stretch displays rotationally resolved substructure. Lower J transitions are absent from the predissociation spectrum, indicating that the upper levels lie below the dissociation threshold. Analysis leads to constants for lower and upper states: v(0)=2981.28, B'=0.048 84, Delta B=9.3x10(-4) cm(-1), and a minimum J'=28 for dissociation. The rotational constants correspond to vibrationally averaged separation between Br- and the C2H2 center of mass of 4.11 Angstrom in the ground state and 4.07 Angstrom in the v(3) state. A dissociation energy for Br--C2H2 of 3020 +/- 3 cm(-1) is estimated from the energy of the lowest dissociating level. The spectroscopically derived data are corroborated by ab initio calculations conducted at the MP2/aug-cc-pVTZ level.