- Incisive foramen
- Incisive foramina
- Incisive papilla
- Incisors
- Inclisiran
- Inclusion
- Inclusion and exclusion criteria
- Inclusion bodies
- Inclusion body myositis
- Incomplete abortion
- Incomplete combustion
- Incomplete dominance
- Incontinence
- Incontinentia pigmenti
- Increased appetite
- Incremental exercise
- Incretin
- Incubation
- Incubation time
- Incudostapedial joint
- Incus
- Indacaterol
- Indapamide
- Indazole
- Indecent exposure
- Indels
- Independent living
- Independent variable
- Indeterminacy
- Index finger
- Indiana pouch
- Indican
- Indications
- Indicator species
- Indicators
- Indigestion
- Indigo carmine
- Indirect DNA damage
- Indirect agonist
- Indirect calorimetry
- Indirect inguinal hernia
- Indirubin
- Indisulam
- Indium 111
- Indium antimonide
- Indium gallium arsenide
- Indium oxide
- Indium phosphide
- Indium tin oxide
- Individual participant data
- Individualized medicine
- Indo-1
- Indocyanine green
- Indolamines
- Indole
- Indole 3 butyric acid
- Indole 3 carbinol
- Indole alkaloids
- Indole test
- Indole-3-acetic acid
- Indolent lymphoma
- Indoline
- Indolizidine
- Indolizidine alkaloids
- Indolizine
- Indolocarbazole
- Indometacin
- Indomethacin
- Indoor air quality
- Indoor residual spraying
- Indoor tanning
- Indoprofen
- Indoxacarb
- Indoxyl
- Indoxyl sulfate
- Induced abortion
- Induced cell cycle arrest
- Induced coma
- Induced fit model
- Induced ovulation
- Induced pluripotent stem cells
- Inducers
- Inducible nitric oxide synthase
- Induction chemotherapy
- Induction period
- Inductive logic
- Inductive reasoning
- Inductively coupled plasma atomic emission spectroscopy
- Inductively coupled plasma mass spectrometry
- Indusium griseum
- Industrial fermentation
- Industrial radiography
- Industrial robots
- Industrial waste
- Industrial wastewater
- Inebilizumab
- Ineffective erythropoiesis
- Inelastic scattering
- Inequality
- Inequality in disease
- Inert gases
- Infant bed
- Infant formula
- Infant massage
- Infant respiratory distress syndrome
- Infantile acne
- Infantile digital fibromatosis
- Infantile esotropia
- Infantile hemangioma
- Infantile hypotonia
- Infantile myofibromatosis
- Infantile neuroaxonal dystrophy
- Infantile neuronal ceroid lipofuscinosis
- Infantile refsum disease
- Infantile spasms
- Infants
- Infarction
- Infection prevention and control
- Infections
- Infectious bursal disease
- Infectious causes of cancer
- Infectious diarrhea
- Infectious diseases
- Infectious dose
- Infectious mononucleosis
- Infectious period
- Infectious tolerance
- Infective endocarditis
- Infectivity
- Inferential statistics
- Inferior alveolar artery
- Inferior alveolar nerve
- Inferior angle of the scapula
- Inferior cerebellar peduncle
- Inferior cluneal nerve
- Inferior colliculus
- Inferior crus
- Inferior epigastric artery
- Inferior epigastric vein
- Inferior epigastric vessels
- Inferior frontal gyrus
- Inferior genicular arteries
- Inferior gluteal artery
- Inferior gluteal nerve
- Inferior gluteal vein
- Inferior gluteal veins
- Inferior hypogastric plexus
- Inferior hypophyseal artery
- Inferior hypophysial artery
- Inferior longitudinal fasciculus