List of diffuse nebulae
This is a list of diffuse nebulae. Most nebulae are diffuse, meaning they do not have well-defined boundaries. Types of diffuse nebulae include emission nebulae and reflection nebulae
Emission and reflection nebulae
    
- Barnard's Loop
 - Boomerang Nebula
 - Bubble Nebula, NGC 7635
 - Bubble Nebula in Barnard's Galaxy
 - California Nebula
 - Carina Nebula
 - Cave Nebula
 - Corona Australis Molecular Cloud
 - Cone Nebula
 - Crescent Nebula
 - Double Helix Nebula
 - Eagle Nebula
 - Elephant's Trunk Nebula
 - Eta Carinae Nebula
 - Flame Nebula
 - Gum Nebula
 - Heart Nebula
 - Homunculus Nebula
 - Horsehead Nebula
 - Lagoon Nebula
 - North America Nebula
 - Omega Nebula
 - Orion Nebula
 - Pistol Nebula
 - Rosette Nebula
 - Running Chicken Nebula
 - Soul Nebula
 - Tarantula Nebula
 - Trifid Nebula
 - Witch Head Nebula
 - Messier 43
 - Messier 78, reflection nebula
 - NGC 248
 - NGC 249
 - NGC 256
 - NGC 261
 - NGC 267
 - NGC 281, Pacman Nebula
 - NGC 346
 - NGC 371
 - NGC 588
 - NGC 595
 - NGC 604
 - NGC 1435, reflection nebula in the Pleiades
 - NGC 1491
 - NGC 1579
 - NGC 1714, NGC 1715
 - NGC 1788, reflection nebula in Orion
 - NGC 1931
 - NGC 1973, NGC 1975 and NGC 1977
 - NGC 1999, reflection nebula in Orion
 - NGC 2014
 - NGC 2023
 - NGC 2080, Ghost Head Nebula
 - NGC 2174
 - NGC 2261, variable reflection nebula in Monoceros
 - NGC 2736, the Pencil Nebula
 - NGC 3576
 - NGC 3603
 - NGC 6188
 - NGC 6193, open cluster with nebulosity in Ara
 - NGC 6334
 - NGC 6357
 - NGC 6559
 - NGC 6589, reflection nebula in Sagittarius near NGC 6590 and I 1284
 - NGC 6590, reflection nebula
 - NGC 6914
 - NGC 7129, reflection nebula in Cepheus, near the open cluster NGC 7142
 - LBN 140
 - LHA 120-N55
 - vdB1
 - IC 349, small reflection nebula in the Pleiades
 - IC 2177
 - IC 2631, reflection nebula in Chamaeleon
 - IC 5146
 
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