Top Sci-Fi Movies & Series subreddits

Largest Sci-Fi Movies & Series subreddits

Largest Sci-Fi Movies & Series subreddits

#	Subreddit	Members	12-mo growth	Commenters / mo
1	r/StarWars	4.7M	+3.7%	36,225
2	r/PrequelMemes	3.82M	+1.3%	5,139
3	r/startrek	1.06M	+4.0%	14,489
4	r/doctorwho	1.02M	+3.3%	9,295
5	r/westworld	989,658	+0.6%	768
6	r/AskScienceFiction	893,904	+2.7%	4,276
7	r/TheMandalorianTV	654,878	+1.7%	1,248
8	r/starwarsmemes	590,450	+3.5%	2,136
9	r/TheHandmaidsTale	526,506	+3.0%	1,455
10	r/blackmirror	508,205	+3.9%	2,073
11	r/SequelMemes	466,830	+0.9%	351
12	r/StarWarsLeaks	426,513	+2.1%	892
13	r/StarWarsEU	347,658	+6.5%	2,455
14	r/GODZILLA	332,943	+14%	11,641
15	r/LV426	315,808	+9.8%	6,177
16	r/Mandalorian	272,042	+1.9%	533
17	r/starwarsspeculation	265,048	+2.6%	206
18	r/TheExpanse	261,902	+9.0%	3,370
19	r/StarWarsCantina	230,331	+13%	4,355
20	r/MawInstallation	229,649	+6.1%	1,807
21	r/DarK	225,695	+9.5%	587
22	r/Stargate	210,641	+18%	8,895
23	r/JurassicPark	208,383	+15%	5,862
24	r/andor	206,268	+15%	5,475
25	r/firefly	182,860	+14%	1,707

Fastest growing Sci-Fi Movies & Series subreddits

Member growth over 12 months, among subreddits that had at least 18,251 members a year ago.

Fastest growing Sci-Fi Movies & Series subreddits

#	Subreddit	12-mo growth	Members gained	Members	Commenters / mo
1	r/FalloutTVseries	+126%	+34,068	61,125	247
2	r/Star_Trek_	+70%	+19,351	46,963	4,447
3	r/predator	+62%	+26,705	69,755	2,236
4	r/StarWarsCirclejerk	+50%	+28,859	87,064	7,562
5	r/SiloSeries	+46%	+38,662	123,085	10,636
6	r/jurassicworld	+42%	+9,552	32,219	1,342
7	r/LowerDecks	+41%	+9,588	33,136	1,131
8	S r/StarTrekTNG	+39%	+9,831	35,319	1,850
9	r/kaiju	+38%	+7,731	28,095	590
10	r/voyager	+37%	+14,364	53,286	3,028
11	r/StarWarsShips	+33%	+14,178	57,284	2,149
12	r/Fotv	+30%	+37,099	161,542	369
13	r/starshiptroopers	+30%	+8,208	35,755	627
14	r/TNG	+30%	+17,156	74,948	4,754
15	r/ForAllMankindTV	+29%	+15,645	68,871	1,207
16	r/StarTrekStarships	+29%	+12,976	57,366	2,538
17	r/PacificRim	+28%	+12,157	55,315	1,385
18	r/BacktotheFuture	+25%	+20,383	102,378	3,299
19	r/matrix	+23%	+20,557	109,632	2,518
20	r/ShittyDaystrom	+23%	+11,893	64,273	4,591
21	r/starwarscanon	+22%	+11,560	63,889	433
22	r/babylon5	+21%	+8,989	52,116	2,878
23	r/clonewars	+20%	+23,786	143,059	4,860
24	r/fringe	+20%	+7,714	46,834	781
25	r/tron	+19%	+9,503	60,217	1,714

Most members gained

Sci-Fi Movies & Series subreddits that gained the most members

#	Subreddit	Members gained	12-mo growth	Members	Commenters / mo
1	r/StarWars	+167,182	+3.7%	4.7M	36,225
2	r/PrequelMemes	+49,160	+1.3%	3.82M	5,139
3	r/GODZILLA	+41,037	+14%	332,943	11,641
4	r/startrek	+40,598	+4.0%	1.06M	14,489
5	r/SiloSeries	+38,662	+46%	123,085	10,636
6	r/Fotv	+37,099	+30%	161,542	369
7	r/FalloutTVseries	+34,068	+126%	61,125	247
8	r/doctorwho	+33,096	+3.3%	1.02M	9,295
9	r/Stargate	+31,541	+18%	210,641	8,895
10	r/StarWarsCirclejerk	+28,859	+50%	87,064	7,562
11	r/LV426	+28,219	+9.8%	315,808	6,177
12	r/JurassicPark	+27,107	+15%	208,383	5,862
13	r/predator	+26,705	+62%	69,755	2,236
14	r/StarWarsCantina	+26,662	+13%	230,331	4,355
15	r/andor	+26,233	+15%	206,268	5,475
16	r/AskScienceFiction	+23,862	+2.7%	893,904	4,276
17	r/clonewars	+23,786	+20%	143,059	4,860
18	r/firefly	+22,168	+14%	182,860	1,707
19	r/TheExpanse	+21,557	+9.0%	261,902	3,370
20	r/StarWarsEU	+21,087	+6.5%	347,658	2,455
21	r/matrix	+20,557	+23%	109,632	2,518
22	r/BacktotheFuture	+20,383	+25%	102,378	3,299
23	r/starwarsmemes	+19,713	+3.5%	590,450	2,136
24	r/DarK	+19,497	+9.5%	225,695	587
25	r/Star_Trek_	+19,351	+70%	46,963	4,447

Most active Sci-Fi Movies & Series subreddits

People who comment in a month, the average of the three months ending September 2026.

Most active Sci-Fi Movies & Series subreddits

#	Subreddit	Commenters / mo	Posts / mo	Members
1	r/StarWars	36,225	2,379	4.7M
2	r/startrek	14,489	1,064	1.06M
3	r/GODZILLA	11,641	2,633	332,943
4	r/SiloSeries	10,636	1,319	123,085
5	r/doctorwho	9,295	1,088	1.02M
6	r/Stargate	8,895	813	210,641
7	r/StarWarsCirclejerk	7,562	1,002	87,064
8	r/LV426	6,177	621	315,808
9	r/JurassicPark	5,862	750	208,383
10	r/andor	5,475	353	206,268
11	r/PrequelMemes	5,139	384	3.82M
12	r/clonewars	4,860	469	143,059
13	r/TNG	4,754	261	74,948
14	r/ShittyDaystrom	4,591	682	64,273
15	r/Star_Trek_	4,447	375	46,963
16	r/StarWarsCantina	4,355	376	230,331
17	r/DeepSpaceNine	4,350	253	105,280
18	r/AskScienceFiction	4,276	781	893,904
19	r/startrekmemes	3,730	421	162,185
20	r/TheExpanse	3,370	254	261,902
21	r/BacktotheFuture	3,299	300	102,378
22	r/DoctorWhumour	3,029	429	152,063
23	r/voyager	3,028	225	53,286
24	r/StarWars_	2,964	271	26,554
25	r/babylon5	2,878	284	52,116

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How these lists are made

• Members are the member counts measured in October 2026.
• Activity (commenters and posts per month) is the average of the three months ending September 2026. Posts by known bots are not counted.
• 12-month growth compares members now with members a year earlier. A subreddit is ranked by growth only if it already had at least 18,251 members a year ago (the median for subreddits with a known growth), so brand-new communities don't top the list from a base of zero. Subreddits with more monthly active users than 0.808 per member, a sign of inflated activity, are left out of the growth and activity lists.
• NSFW communities are excluded: those Reddit marks as 18+, those where most posts are NSFW, and the Adult Content topic.
• Topics follow Reddit's own community categories.
• The lists are rebuilt every month. Each list shows the top 25 (100 for the largest subreddits overall). Download all lists as CSV (free to reuse under CC BY 4.0, with a link to this page).