Suicide is Haram in Islam

It is Narrated on the authority of Abu Huraira RadiyAllahu Anhu that the Messenger of Allah (Sallallahu Alaihi Wasallam) observed: He who killed himself with steel (weapon) would be the eternal denizen of the Fire of Hell and he would have that weapon in his hand and would be thrusting that in his stomach for ever and ever, he who drank poison and killed himself would sip that in the Fire of Hell where he is doomed for ever and ever; and he who killed himself by falling from (the top of) a mountain would constantly fall in the Fire of Hell and would live there for ever and ever.

[Sahih Muslim :: Book 1 :: Hadith 199]

Urdu Translation: Hazrat Abu Huraira RadiyAllahu Anhu se Riwayat hai ke RasoolAllah Sallallahu Alaihi Wasallam ne Irshad Farmaya: Jis ne lohe ke hathyar se khud kushi ki to Jahannam ki Aag mein wo hathyar us ke hath mein hoga aur wo us se apne Pait ko hamesha zakhmi karta rahega, aur Jis ne zaher pi kar khud kushi ki to wo bhi Jahannam ki Aag mein hamesha hamesha us zaher ko ghoont ghoont kar pita rahega aur Jis ne pahad (ya kisi unchi jaga) se gir kar Khud kushi ki to wo bhi Jahannam ki Aag mein hamesha hamesha pahad se yunhi girta rahega.

[Urdu Ref :: Sahih Muslim :: Vol.1 :: Hadith 300]