Bollywood is fertile to produce great comedians.

its difficult to choose five.lets try.

1-Johny Walker

2-Mehmood

3-Asrani

4-Om Prakash ( has unique style)

5-Utpal Dutt

Good choice Adnan

my take is:

1-Johny Walker

2-Mehmood

3-Kishore kumar

4-Om Prakash

5-Utpal Dutt

 and also Paresh rawal,Rajpal yadav,Amol palekar,Faaroq shaikh etc

my take

 1.boman irani

2.govinda

3 khader khan

4. kishore kumar

5.johny lever

also mehmood and kesht mukherji

my take

Johny walker

om prakash

govinda

amol palekar

mehmood 

MEHEMOOD

KISHORE KUMAR

JOHNNY WALKER

IP JOHAR

PINTEL

AND ALSO FAROOQ,AND UTPAL DUTT

my fav comedian is

jhony lever,

rajpal yadav,

akshy kumar,

javed jaffery,

shahid kapoor.

Well top five Comedians according to me.............in descending order....

1.Mahmood ( The Best)

2.Castro Mukherji...( He has tremendous Style to emote)

3. Jhony Lever..( fro bringing the Comedian's importance in the movies)

4. Paresh Rawal.( TRhe best timing ever)

5.  Govinda..( Now nobody can defeat him in this field as he alwyas has performed the comedy to the masterpeice)

UD.... 

1.Mehmood

2.Mehmood

3.Mehmood

4.Mehmood

5.Raju Srivastva