We study the effect of large scale tangled magnetic fields on the galaxy two-point correlation function in the redshift space .
We show that ( a ) the magnetic field effects can be comparable the gravity-induced clustering for present magnetic field strength B _ { 0 } \simeq 5 \times 10 ^ { -8 } G , ( b ) the absence of this signal from the present data gives an upper bound B _ { 0 } \lower 2.15 pt \hbox { $ \buildrel < \over { \sim } $ } 3 \times 10 ^ { -8 } G , ( c ) the future data can probe the magnetic fields of \simeq 10 ^ { -8 } G .
A comparison with other constraints on the present magnetic field shows that they are marginally compatible .
However if the magenetic fields corresponding to B _ { 0 } \simeq 10 ^ { -8 } G 
existed at the last scattering surface they will cause unacceptably large CMBR anisotropies .

Key Words : Cosmology : theory—Large-scale structure of the universe—Magnetic fields—MHD