Two Escherichia coli genes, expressed from multicopy plasmids, are shown to cause partial induction of prophage  in recA mutant lysogens. One is rcsA, which specifies a positive transcriptional regulator of the cps genes, which are involved in capsular polysaccharide synthesis. The other is dsrA, which specifies an 85-nucleotide RNA that relieves repression of the rcsA gene by histone-like protein H-NS. Genetic contexts known to increase Cps expression also cause RecA-independent  induction: the rcsC137 mutation, which causes constitutive Cps expression, and the lon and rcsA3 mutations, which stabilize RcsA. Lambdoid phages 21, 80, and 434 are also induced by RcsA and DsrA overexpression in recA lysogens. Excess  cI repressor specifically blocks  induction, suggesting that induction involves repressor inactivation rather than repressor bypass. RcsA-mediated induction requires RcsB, the known effector of the cps operon, whereas DsrA-mediated induction is RcsB independent in stationary phase, pointing to the existence of yet another RecA-independent pathway of prophage induction.