A/N: Okay, so this was made to help me with this parody video that I'm making concerning Captain Kirk, and I threw in anyone else who had a serious romance in the show more than once. The result is... this. A list of all girlfriends/one night stands/something from five of our guys. Whether they were seduced, seducing, forced by aliens, or fell in love, no one can forget the gals of Star Trek (of which I own nothing). Some spellings may be incorrect.
1-31-14: Updated to a few suggestions. Animaltalker, I'm not including Valeris because she was Spock's protégé, and they had a more academic relationship. Also, Saavikam69, I'm not doing the gals for now, as they (like Chapel and Rand) only had one serious romance and not several, crushes aside.
Scotty
Lt. Carolyn Palamos: Who Mourns for Adonais?
Kara: Wolf in the Fold
Lt. Mira Romaine: The Lights of Zetar
Uhura (mild; implied): The Final Frontier
Chekov
Yeoman Marta Landon: The Apple
Tamoon (alien's unrequited love): The Gamesters of Triskelion
Sylvia: Spectre of the Gun
Mara (kind of): Day of the Dove
Irina: The Way to Eden
McCoy
Nancy Crater: The Man Trap
Tonia Barrows: Shore Leave
Eleen (sort of): Friday's Child
Natira: For the World is Hollow and I have Touched the Sky
Gem (?): The Empath
Bonus: his ex-wife (off-screen)
Spock
Nurse Chapel (her unrequited): series
Leila Kalomi: This Side of Paradise
T'Pring: Amok Time
Romulan Commander: The Enterprise Incident
Droxine: The Cloud Minders
Zarabeth: All Our Yesterdays
Saavik (pon farr induced): The Search for Spock
Kirk
Janice Rand (unrequited): The Naked Time, The Enemy Within, Miri
Eve: Mudd's Women
Andrea: What Are Little Girls Made Of?
Miri (her schoolgirl crush): Miri
Dr. Helen Noel: Dagger of the Mind
Lenore Keridian: The Conscience of the King
Areel Shaw: Court Martial
Ruth: Shore Leave
Mea 3 (a bit): A Taste of Armageddon
Edith Keeler: City on the Edge of Forever
Marlena Moreau: Mirror, Mirror
Sylvia: Catspaw
Janet Wallace: The Deadly Years
Shahna: The Gamesters of Triskelion
Nona: A Private Little War
Kelinda: By Any Other Name
Drusilla: Bread and Circuses
Miramanee: The Paradise Syndrome
Dr. Miranda Jones: Is There in Truth No Beauty?
Deela: Wink of an Eye
Elaan: Elaan of Troyius
Marta: Whom Gods Destroy
Odona: The Mark of Gideon
Rayna: Requiem for Methuselah
Vanna: The Cloud Minders
Janice Lester (once): Turnabout Intruder
Carol Marcus: The Wrath of Khan
Gillian Taylor: The Voyage Home
Martia: The Undiscovered Country
And, there you have it! Please let me know if I missed anyone!