Inspired by @Peace_Out_List (*—because I'm just too lazy to rank them)
  1. Joey Travers (Fred Astaire) and Dale Tremont (Ginger Rogers) in Top Hat (1935)
  2. Rhett Butler (Clark Gable) and Scarlet O'Hara (Vivien Leigh) in Gone With the Wind (1939)
  3. Rick Blaine (Humphrey Bogart) and Ilsa Lund (Ingrid Bergman) in Casablanca (1942)
  4. Steve (Humphrey Bogart) and Slim (Lauren Bacall) in To Have and Have Not (1944)
  5. Phillip Marlowe (Humphrey Bogart) and Vivian Rutledge (Lauren Bacall) in The Big Sleep (1946)
  6. George Bailey (James Stewart) and Mary in It's a Wonderful Life (1946)
  7. Milton Warden (Burt Lancaster) and Karen Holmes (Deborah Kerr) in From Here to Eternity (1953)
  8. Princess Anne (Audrey Hepburn) and Joe Bradley (Gregory Peck) in Roman Holiday (1953)
  9. Carmen Jones (Dorothy Dandridge) and Joe (Harry Belafonte) in Carmen Jones (1954)
  10. Lady (Barbara Luddy) and the Tramp (Larry Roberts) in Lady and the Tramp (1955)
  11. Conrad Burns (Cary Grant) and Frances Stevens (Grace Kelly) in To Catch a Thief (1955)
  12. Ariane Chavasse (Audrey Hepburn) and Frank Flannagan (Gary Cooper) in Love in the Afternoon (1957)
  13. Jo Stockton (Audrey Hepburn) and Dick Avery (Fred Astaire) in Funny Face (1957)
  14. Holly Golightly (Audrey Hepburn) and Paul Varjak (George Peppard) in Breakfast at Tiffany's (1961)
  15. Maria (Julie Andrews) and Captain Von Trapp (Christopher Plummer) in The Sound of Music (1965)
  16. Nicole Bonnet (Audrey Hepburn) and Simon Dermott (Peter O'Toole) in How to Steal a Million (1966)
  17. Joanna Wallace (Audrey Hepburn) and Mark Wallace (Albert Finney) in Two for the Road (1967)
  18. John Prentice (Sidney Poitier) and Joey Drayton (Katharine Houghton) in Guess Who's Coming to Dinner (1967)
  19. Benjamin Braddock (Dustin Hoffman) and Mrs. Robinson (Anne Bancroft) in The Graduate (1967)
  20. Han Solo (Harrison Ford) and Princess Leia (Carrie Fisher) in Star Wars: The Empire Strikes Back (1980)
  21. Indiana Jones (Harrison Ford) and Marion Ravenwood (Karen Allen) in Raiders of the Lost Ark (1981)
  22. Zack Mayo (Richard Gere) and Paula Pokrifki (Debra Winger) in An Officer and a Gentleman (1982)
  23. Samantha Baker (Molly Ringwald) and Jake Ryan (Michael Schoeffling) in Sixteen Candles (1984)
  24. Claire Standish (Molly Ringwald) and John Bender (Judd Nelson) in The Breakfast Club (1985)
  25. George McFly (Crispin Glover) and Lorraine Baines (Lea Thompson) in Back to the Future (1985)
  26. Baby Houseman (Jennifer Grey) and Johnny Castle (Patrick Swayze) in Dirty Dancing (1987)
  27. Westley (Cary Elwes) and Princess Buttercup (Robin Wright) in The Princess Bride (1987)
  28. Lloyd Dobbler (John Cusack) and Diane Court (Ione Skye) in Say Anything... (1989)
  29. Harry Burns (Billy Crystal) and Sally Albright (Meg Ryan) in When Harry Met Sally... (1989)
  30. Vivian Ward (Julia Roberts) and Edward Lewis (Richard Gere) in Pretty Woman (1990)
  31. Vada Sultenfuss (Anna Chlumsky) and Thomas J. Sennett (Macaulay Culkin) in My Girl (1991)
  32. Batman (Michael Keaton) and Catwoman (Michelle Pfeiffer) in Batman Returns (1992)
  33. Charles (Hugh Grant) and Carrie (Andie McDowell) in Four Weddings and a Funeral (1994)
  34. Cher Horowitz (Alicia Silverstone) and Josh (Paul Rudd) in Clueless (1995)
  35. Romeo (Leonardo DiCaprio) and Juliet (Claire Danes) in William Shakespeare's Romeo + Juliet (1996)
  36. Jerry Maguire (Tom Cruise) and Dorothy Boyd (Renée Zellweger) in Jerry Maguire (1996)
  37. Patrick Verona (Heath Ledger) and Kat Stratford (Julia Stiles) in 10 Things I Hate About You (1999)
  38. Josie Geller (Drew Barrymore) and Sam Coulson (Michael Vartan) in Never Been Kissed (1999)
  39. William Miller (Patrick Fugit) and Penny Lane (Kate Hudson) in Almost Famous (2000)
  40. Amélie (Audrey Tautou) and Nino Quincampoix (Matthieu Kassovitz) in Amélie (2001)
  41. Peter Parker (Tobey Maguire) and Mary Jane Watson (Kirsten Dunst) in Spider-Man (2002)
  42. Melanie Smooter (Reese Witherspoon) and Jake Perry (Josh Lucas) in Sweet Home Alabama (2002)
  43. Bob Harris (Billy Murry) and Charlotte (Scarlett Johansson) in Lost in Translation (2003)
  44. Jenna Rink (Jennifer Garner) and Matt Flamhaff (Mark Ruffalo) in 13 Going on 30 (2004)
  45. Johnny Cash (Joaquin Phoenix) and June Carter (Reese Witherspoon) in Walk the Line (2005)
  46. Ennis del Mar (Heath Ledger) and Jack Twist (Jake Gyllenhaal) in Brokeback Mountain (2005)
  47. Tom Hansen (Joseph Gordon-Levitt) and Summer (Zooey Daschanel) in (500) Days of Summer (2009)
  48. Peggy Carter (Hayley Atwell) and Steve Rogers/Captain America (Chris Evans) in Captain America: The First Avenger (2011)
  49. Suzy Bishop (Kara Hayward) and Sam (Jared Gilman) in Moonrise Kingdom (2012)
  50. Charlie (Logan Lerman) and Sam (Emma Watson) in The Perks of Being a Wallflower (2012)
  51. Charlie (Logan Lerman) and Patrick (Ezra Miller) in The Perks of Being a Wallflower (2012)
  52. Samantha Borgens (Lily Collins) and Louis (Logan Lerman) in Stuck in Love (2013)
  53. Duncan (Liam James) and Susanna (AnnaSophia Robb) in The Way, Way Back (2013)
  54. Mia (Cholë Grace Moretz) and Adam (Jamie Blackley) in If I Stay (2014)
  55. Cinderella (Lily James) and Prince Charming (Richard Madden) in Cinderella (2015)