Here are some main hotel properties listed in no particular order only in their proximity to BTS stations:

Asok BTS:
SGS
WGS

Nana BTS:
JW Marriott

Phloen Chit BTS:
JW Marriott
Plaza Athénée-A Royal Méridien Hotel
Renaissance Bangkok
Conrad Bangkok

Chitlom BTS:
Intercontinental Bangkok
Holiday Inn Bangkok
Grand Hyatt Erawan
Four Seasons
Centara Grand @ CentralWorld
Courtyard by Marriott

Siam BTS:
Novotel

National Stadium (MBK):
Pathumwan Princess Hotel
Siam @ Siam

Sala Daeng BTS:
Dusit Thani

Saphan Taksin BTS:
Shangri-La Hotel
Oriental Hotel
The Peninsula Hotel
ROS

Asok (Sukhumvit MRT) & Sala Daeng (Si Lom MRT) are also connected to the Bangkok Metro system (MRT). Hope this will help you decide on which hotel to book.