1,5-Diazacyclooctane is an organic compound with the formula (CH2CH2CH2NH)2.

[1] It is prepared in low yield by the alkylation of ammonia with 1,3-dibromopropane.

[2] The N-H centers can be replaced with many other groups.

As a bis secondary amine, it condenses with aldehydes to give bicyclic derivatives.

[3] When treated with transition metal salts, it serves as a chelating ligand.