Ouran Highschool Host Club?

Well in some way it seems that everybody except for Kyouya is in love with Haruhi, the only reason being that there would be no merit for him being with her. As the manga says, Kaoru gave up on Haruhi after kissing her because of the feelings that Hikaru has for her. Near the end, I believe that it states that Honey and Takashi also had feelings for her although they end up with other people. Although for HIkaru, he eventually confesses to Haruhi but is ultimately rejected by her. So of course in the end Tamaki and Haruhi end up together.

Have you read the manga?

Hikaru, Kaoru and Tamaki are in love with Haruhi. Huni and Mori like Haruhi but not in the romantic way. Kaoru confessed to Haruhi but told her that Hikaru was more important. I'm not sure how Kyoya feels about her because they didn't get on that very much. Honey thought that Kyoya would be the most attracted to Haruhi but Kyoya once said that pursuing her would have no merit for him. Now whether or not that meant that he didn't have any romantic interest in her is unclear. Tamaki is his best friend and he could have just backed off cause of his feelings. Kinda like Kaoru had done with Hikaru.

Only Hikaru and Tamaki have serious feelings towards her. Kaoru has a slight crush for a while but that disappears over time. The other two never really think of her romantically.

The Twins most defentaly do. I am pretty sure that all of them have just a little thing for her.