Rain tree (Samanea saman) is a fast-growing tropical tree, abundantly grown in India under plantation programmes. The present study was carried out to evaluate the effects of processed rain tree pod (RTP) in the diets of Catla catla fry. Chemical analysis results indicated that RTP is a good source of protein (25.2% CP) and energy (4.88 kcal/g), and contains 1–2% of ether extract with 44% PUFA. Additionally, it contained 7.4% tannins, 2.25% saponin, and 1.57% alkaloids. Water soaking followed by autoclaving of raw RTP reduced tannin and saponin contents. Five iso-nitrogenous test feeds were formulated incorporating raw (F1) and differently processed RTP (F2-F5) at 30% level with groundnut oilcake and rice bran as co-ingredients and fed to Catala catla fry reared in indoor FRP tanks for 60d. Results indicated that fish of raw or processed RTP fed groups did not show any significant (P>0.05) differences in survival (98–99%), average weight gain (0.30–0.31 g), FCR (1.11–1.14) and specific growth rate (SGR; 1.76–1.82%/day). Nonetheless, the protein efficiency ratio (PER) and net protein utilization (NPU) values varied significantly (P<0.05) between the raw and processed RTP groups. It is inferred that the tannin, saponin and alkaloid contents in raw RTP are possibly in the safe level when incorporated at 30% level in the diet of Catla fry. Hence, there appears to be further scope to incorporate the processed rain tree pod meal beyond 30% level in the carp feed.