Thennilavu (pronounced [teːn nilaʋu] transl. Honeymoon) is a 1961 Indian Tamil-language romantic comedy film written, produced and directed by Sridhar. It stars Gemini Ganesan (credited as Ganesh) and Vyjayanthimala, with K. A. Thangavelu, M. N. Nambiar, M. Saroja and Vasanthi in supporting roles. The film's plot is about a man who, due to mistaken identity, is appointed as a manager by a young woman for her father's honeymoon in Kashmir. The man and the woman fall in love but things go awry when the real manager arrives in Kashmir.

Thennilavu is the first film Sridhar produced through his production company Chitralaya; it is also the first South Indian film to be made in Jammu and Kashmir; additional filming took place in Madras (now Chennai) and Kodaikanal. Principal photography took about two months to complete. A. M. Rajah composed the soundtrack and Kannadasan wrote the lyrics. Cinematography was handled by A. Vincent, art direction by Ganga and editing by T. R. Srinivasulu. The film was released on 30 September 1961 and became a commercial success.