Karthik or Kartik may refer to:
Kartik
Kartik Aaryan (born 1990), Indian actor
Kartik Chandran, American environmental engineer
Kartik Jeshwant (born 1964), Indian cricketer
Kartik Joshi (born 1995), Indian cricketer
Kartik Oraon (1924-1981), Indian politician and Adivasi Member of Parliament
Kartik Shetty (born 1987), Indian actor and director
Kartik Tyagi (born 2000), Indian cricketer
Karthik
Karthik (actor) (born 1960), Indian Tamil actor known as Navarasa Nayagan
Karthik (singer) (born 1980), Indian singer
Karthik Ghattamneni, Indian cinematographer and film director in Telugu cinema
Karthik Jayaram, Indian actor in Kannada films
Karthik Netha, Indian poet and lyricist
Karthik Raj, Indian actor who works in Tamil film and television
Karthik Raja (born 1973), Indian composer
Karthik Sarma (born 1974/1975), Indian-American billionaire hedge fund manager
Karthik Subbaraj, Indian film director, writer and producer
Kartik
Kalpana Kartik (born 1931), Hindi film actress
Murali Kartik (born 1976), Indian cricketer
Karthik
Arun Karthik (born 1986), Indian cricketer
Avishek Karthik, Indian film actor in Tamil films
Dhanish Karthik (born 1989), Indian actor
Dinesh Karthik (born 1985), Indian cricketer
Dipika Pallikal Karthik (born 1991), Indian squash player
Gautham Karthik (born 1989), Indian Tamil film actor
Sabari Karthik (born 1990), Indian karate player
Sai Karthik, or Sai Kartheek, Indian film score composer and music director
T. M. Karthik, Indian stage and film actor
Other
Kartik (month), a month in the Indian National, Tamil and Bengali calendars
Kartik (Nepali calendar), the seventh month in the Nepali calendar
Kartik (Gemma Doyle Trilogy), a character in a trilogy of fantasy novels
Kartik BLT, Indian armoured vehicle-launched bridge (AVLB)