Onkologi iku sub-babagan medhis kang nyinaoni lan ngrawat kanker. Dhokter kang nekuni onkologi karan onkolog. Istilah iki asal saka basa Yunani: onkos (ονκος), kang tegesé masa utawa tumor l panambang -ology, kang tegesé "nyinaoni".

Onkologis bisa dipérang miturut jinis perawatan kang disadiakaké.
 Onkologi radhiasi: orang kang mligi ngenani perawatan kanker nganggo radhiasi, siji prosès kang karan radhioterapi.
 Bedhah Onkologi iku kang ahli sajeroning pambuangan tumor, kang ana ing pérangan:

 Bedhah
 THT-KL
 Obsgyn
 Mata
 Onkologi medhis iku kang migunakaké pangobatan utawa kemoterapi kanggo ngrawat kanker.

Onkologi ngayahi bab ig ngisor iki:
 diagnosis kanker
 Terapi (ya iku operasi, kemoterapi, radhioterapi lll)

Uga delengen 
 Terapi Gen
 Pengobatan Anti-angiogenesis
 Perawatan kanker eksperimental

Pranala njaba 
 Rumah Kanker - Informasi Pengobatan dan Perawatan Kanker
 National Cancer Institute
 American Cancer Society
 Canadian Cancer Society
 BC Cancer Agency
 International Agency for Research on Cancer
 Cancer Research UK
 Cancerbackup
 MacMillan cancer relief
 Panduan Quackwatch untuk terapi kanker alternatif
 Oncowiki: A Wiki based repository of Cancer Chemotherapy Regimens
 People Living With Cancer South Africa 
 Articles on the scientific basis of popular alternatives.

 
Spesialisasi medhis
Kedhokteran