Ninaithen Vandhai (transl. When I Thought of You, You Came) is a 1998 Indian Tamil-language romantic drama film directed by K. Selva Bharathy and produced by Allu Aravind. The film stars Vijay, Rambha and Devayani in the lead roles, with Manivannan, Malaysia Vasudevan, Ranjith, Senthil, and Vinu Chakravarthy in supporting roles. It is a remake of the 1996 Telugu film Pelli Sandadi. The film was released on 10 April 1998 to positive  reviews  and became a commercial success.
 Gokula Krishnan is a music-loving man who begins the film with a dream where he sees his dream girl. The only trademark he remembers from it is a mole which is situated next to her navel. He then becomes determined in looking for his "dream girl" with the help of his uncle and brothers-in-law. On the other hand, his father Sandhana Goundar arranges his marriage to a village girl named Savithri, which Gokul (often referred to as "Mapillai") objects to, but Savithri loves him. Gokul later sees his dream girl, Swapna, at a wedding, where he spots the mole on her navel. He then sings to her, impressing her, but she leaves abruptly. He later sees her at a music class which he teaches, and from then on, they love each other. Gokul tries to stop the marriage with Savithri in many failed attempts due to everyone in Savithri's family getting the wrong impression. Swapna then arrives to Savithri's village, and it is revealed that they are sisters. Neither of them knew that they love the same man.
 Gokul tells Savithri's father that he does not want the marriage, which Swapna overhears. Knowing how much her sister loves him, Swapna is determined to get Gokul to forget her by faking that she has a blood clot in her heart. After much persuasion, Gokul agrees to marry Savithri. Throughout the film, another man, Vignesh, is in love with Swapna and tries to get her to marry him and if not, he will kill her with him also. When Vignesh reveals after almost killing Savithri that he loved Swapna but said that she will only love and marry Gokul, Savithri lets Swapna marry him.
 The film was a remake of the Telugu film Pelli Sandadi (1996). The film marked the debut of Sundar C's erstwhile dialogue writer K. Selva Bharathy. Actor and comedian Goundamani was initially expected to portray a key role, but eventually did not feature.
 Ninaithen Vandhai released on 10 April 1998. D. S. Ramanujam of The Hindu wrote, "Debutant director K. Selvabharathi sets a brisk pace throughout, bringing out the finer moments of the love-struck trio with adequate situations". Ananda Vikatan gave the film a score of 35 out of 100. R. P. R. of Kalki called it a classic story which can be watched once only for thrills.
 The success of the film prompted film-makers to sign on Rambha to appear alongside Vijay in a couple of his next projects – Endrendrum Kadhal (1999) and Minsara Kanna (1999).
 The music was composed by Deva. Three of the tunes were borrowed from the original Telugu film (Unnai Ninaithu, Pottu Vaithu & Un Marbile Vizhi). The song "Vannanilavae Vannanilavae" is set to the raga Madhukauns, "Maligayae Maligaiyae", "Unai Ninaithu Naan Enai" and "Un Marbile Vizhi Moodi" are set to Hindolam, "Ennavale Ennavale" is set to Shuddha Dhanyasi and "Pottu Vaithu Poomudikkum" is set to Hamsanandi.