  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 $B_0 \la 3
\times 10^{-8}$ 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.
