According to the police, the first incident took place at a hotel near the clock-tower where medical representative Ajay Singh (35) was staying.
Singh hung himself yesterday prima facie due to family related tensions.
The second incident was reported near Anwarganj where a driver, Bindeshwari Awasthi (28), took his life by consuming poison over a prolonged marital discord.
The last of the three incidents was reported from Naubasta locality where a BA second year student, Neelam (22), allegedly consumed poison after a dispute with her sister-in-law.
The bodies have been sent for post-mortem and investigations initiated in the cases, police added.