The electrical conductivity of yttrium-doped SrTiO 3 with transition metals added as acceptor dopants (V, Mn, Fe, Co, Ni, Cu, Zn, Mo, Mg, Zr, Al, or Ga) was measured by the dc four-probe method at 600-900 o C in reducing atmospheres. The replacement of 5mol% titanium by acceptors leads to a decrease of conductivity of Sr 1 - 1 . 5 x Y x TiO 3 - δ . The degree of the decrease depends strongly on the type of dopant. Of the 5mol% acceptor-doped compositions, the system Sr 0 . 8 5 Y 0 . 1 0 Ti 0 . 9 5 Co 0 . 0 5 O 3 - δ had the highest conductivity of 45S/cm at 800 o C and oxygen partial pressure of 10 - 1 9 atm. The oxidation kinetics of yttrium-doped SrTiO 3 was significantly retarded by the addition of cobalt or manganese dopants. The ionic conductivity of SrTiO 3 doped with 5mol% acceptors at Ti-sites was estimated from the total conductivity to lie in the vicinity of 10 - 4 S/cm, depending on oxygen partial pressure and temperature.