Creating a list of 100 annual flowers might be exhaustive, but I can definitely provide you with a diverse selection of popular annuals:

1. Marigold (Tagetes)
2. Petunia (Petunia x hybrida)
3. Zinnia (Zinnia elegans)
4. Cosmos (Cosmos bipinnatus)
5. Sunflower (Helianthus annuus)
6. Bachelor’s Button (Centaurea cyanus)
7. Impatiens (Impatiens walleriana)
8. Alyssum (Lobularia maritima)
9. Snapdragon (Antirrhinum majus)
10. Geranium (Pelargonium)
11. Begonia (Begonia spp.)
12. Calendula (Calendula officinalis)
13. Nasturtium (Tropaeolum majus)
14. Celosia (Celosia argentea)
15. Lobelia (Lobelia erinus)
16. Vinca (Catharanthus roseus)
17. Sweet Alyssum (Lobularia maritima)
18. Salvia (Salvia splendens)
19. Portulaca (Portulaca grandiflora)
20. Gazania (Gazania rigens)
21. Pansy (Viola tricolor var. hortensis)
22. Coleus (Plectranthus scutellarioides)
23. Dianthus (Dianthus caryophyllus)
24. Gerbera Daisy (Gerbera jamesonii)
25. Lantana (Lantana camara)
26. Nemesia (Nemesia strumosa)
27. Verbena (Verbena x hybrida)
28. Salpiglossis (Salpiglossis sinuata)
29. Stock (Matthiola incana)
30. Swan River Daisy (Brachycome iberidifolia)
31. Torenia (Torenia fournieri)
32. Viola (Viola cornuta)
33. Ageratum (Ageratum houstonianum)
34. Browallia (Browallia speciosa)
35. Cleome (Cleome hassleriana)
36. Datura (Datura spp.)
37. Godetia (Clarkia spp.)
38. Heliotrope (Heliotropium arborescens)
39. Madagascar Periwinkle (Catharanthus roseus)
40. Nicotiana (Nicotiana spp.)
41. Poppy (Papaver spp.)
42. Scabiosa (Scabiosa atropurpurea)
43. Tithonia (Tithonia rotundifolia)
44. Love-in-a-Mist (Nigella damascena)
45. Clarkia (Clarkia amoena)
46. Clarkia (Clarkia unguiculata)
47. Clarkia (Clarkia speciosa)
48. China Aster (Callistephus chinensis)
49. Cockscomb (Celosia cristata)
50. Cornflower (Centaurea cyanus)
51. Dianthus (Dianthus barbatus)
52. Four O’Clock (Mirabilis jalapa)
53. Globe Amaranth (Gomphrena globosa)
54. Helichrysum (Helichrysum bracteatum)
55. Honesty (Lunaria annua)
56. Larkspur (Consolida spp.)
57. Love Lies Bleeding (Amaranthus caudatus)
58. Nigella (Nigella damascena)
59. Ornamental Kale (Brassica oleracea var. acephala)
60. Ornamental Millet (Pennisetum glaucum)
61. Ornamental Pepper (Capsicum annuum)
62. Strawflower (Xerochrysum bracteatum)
63. Stock (Matthiola incana)
64. Sweet William (Dianthus barbatus)
65. Tithonia (Tithonia diversifolia)
66. Torenia (Torenia fournieri)
67. Verbena (Verbena x hybrida)
68. Vinca (Catharanthus roseus)
69. Wax Begonia (Begonia x semperflorens-cultorum)
70. Wishbone Flower (Torenia fournieri)
71. Nasturtium (Tropaeolum majus)
72. Floss Flower (Ageratum houstonianum)
73. Annual Baby’s Breath (Gypsophila elegans)
74. Floss Flower (Ageratum houstonianum)
75. Sweet Pea (Lathyrus odoratus)
76. Swan River Daisy (Brachycome iberidifolia)
77. Love-in-a-Mist (Nigella damascena)
78. Strawflower (Helichrysum bracteatum)
79. Four O’Clock (Mirabilis jalapa)
80. Celosia (Celosia spp.)
81. Torenia (Torenia fournieri)
82. Sweet William (Dianthus barbatus)
83. Clarkia (Clarkia amoena)
84. China Aster (Callistephus chinensis)
85. California Poppy (Eschscholzia californica)
86. Baby’s Breath (Gypsophila paniculata)
87. Lavender Cotton (Santolina chamaecyparissus)
88. Lily of the Nile (Agapanthus africanus)
89. Gaura (Gaura lindheimeri)
90. Baby Blue Eyes (Nemophila menziesii)
91. Bird of Paradise (Strelitzia reginae)
92. Blood Flower (Asclepias curassavica)
93. Butterfly Weed (Asclepias tuberosa)
94. Cape Daisy (Osteospermum spp.)
95. Celosia (Celosia argentea)
96. Chrysanthemum (Chrysanthemum spp.)
97. Cleome (Cleome hassleriana)
98. Copper Canyon Daisy (Tagetes lemmonii)
99. Corn Poppy (Papaver rhoeas)
100. Crimson Clover (Trifolium incarnatum)

This diverse selection of annual flowers offers a wide range of colors, shapes, sizes, and growing habits, providing endless possibilities for adding beauty and interest to your garden or landscape. *as an Amazon affiliate I may earn commission on qualifying purchases