Top Science News & Discussion subreddits

Largest Science News & Discussion subreddits

Largest Science News & Discussion subreddits

#	Subreddit	Members	12-mo growth	Commenters / mo
1	r/science	34.57M	+0.9%	28,225
2	r/sciencememes	3.89M	+1.8%	3,525
3	r/labrats	729,592	+7.1%	6,409
4	r/EverythingScience	667,200	+8.8%	3,901
5	N r/Nootropics	453,059	+5.7%	1,857
6	r/skeptic	353,600	+6.6%	2,811
7	r/sciences	241,108	+9.6%	793
8	L r/longevity	213,722	+8.7%	263
9	r/AskScienceDiscussion	193,641	+16%	1,689
10	r/AncestryDNA	176,363	+26%	6,776
11	r/timetravel	167,462	+22%	2,544
12	r/immortalists	138,751	+101%	2,201
13	r/STEW_ScTecEngWorld	123,960	+28%	3,465
14	r/ScienceUncensored	113,495	+2.0%	131
15	r/NooTopics	113,453	+88%	3,947
16	r/nuclear	100,693	+24%	1,094
17	H r/holdmybeaker	94,700	+0.6%	1
18	r/HotScienceNews	80,950	+137%	5,769
19	S r/ScienceFacts	67,839	+2.3%	0
20	r/scihub	57,571	+15%	78
21	r/wheresthebeef	57,321	+1.5%	92
22	V r/VXJunkies	56,567	+4.9%	153
23	r/ContagionCuriosity	46,474	+136%	1,934
24	r/fusion	45,519	+30%	347
25	r/pharmacology	35,984	+12%	45

Fastest growing Science News & Discussion subreddits

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

Fastest growing Science News & Discussion subreddits

#	Subreddit	12-mo growth	Members gained	Members	Commenters / mo
1	r/HotScienceNews	+137%	+46,841	80,950	5,769
2	r/ContagionCuriosity	+136%	+26,744	46,474	1,934
3	r/immortalists	+101%	+69,689	138,751	2,201
4	r/NooTopics	+88%	+52,946	113,453	3,947
5	r/signalidentification	+48%	+11,604	35,567	189
6	r/cellular_automata	+38%	+9,508	34,780	143
7	A r/Acoustics	+35%	+7,943	30,798	577
8	r/illustrativeDNA	+31%	+7,761	32,491	1,096
9	I r/Immunology	+31%	+6,128	26,163	165
10	r/fusion	+30%	+10,522	45,519	347
11	r/STEW_ScTecEngWorld	+28%	+26,881	123,960	3,465
12	r/AncestryDNA	+26%	+36,847	176,363	6,776
13	r/nuclear	+24%	+19,691	100,693	1,094
14	r/timetravel	+22%	+29,743	167,462	2,544
15	B r/BlackPillScience	+19%	+5,330	33,281	97
16	r/AskScienceDiscussion	+16%	+26,404	193,641	1,689
17	r/scihub	+15%	+7,442	57,571	78
18	r/ImmaterialScience	+15%	+4,236	32,795	30
19	r/psychopharmacology	+13%	+2,591	22,380	34
20	r/pharmacology	+12%	+3,781	35,984	45
21	r/sciences	+9.6%	+21,061	241,108	793
22	r/EverythingScience	+8.8%	+53,949	667,200	3,901
23	L r/longevity	+8.7%	+17,058	213,722	263
24	T r/tDCS	+8.4%	+1,665	21,540	58
25	r/labrats	+7.1%	+48,061	729,592	6,409

Most members gained

Science News & Discussion subreddits that gained the most members

#	Subreddit	Members gained	12-mo growth	Members	Commenters / mo
1	r/science	+307,636	+0.9%	34.57M	28,225
2	r/sciencememes	+70,367	+1.8%	3.89M	3,525
3	r/immortalists	+69,689	+101%	138,751	2,201
4	r/EverythingScience	+53,949	+8.8%	667,200	3,901
5	r/NooTopics	+52,946	+88%	113,453	3,947
6	r/labrats	+48,061	+7.1%	729,592	6,409
7	r/HotScienceNews	+46,841	+137%	80,950	5,769
8	r/AncestryDNA	+36,847	+26%	176,363	6,776
9	r/timetravel	+29,743	+22%	167,462	2,544
10	r/STEW_ScTecEngWorld	+26,881	+28%	123,960	3,465
11	r/ContagionCuriosity	+26,744	+136%	46,474	1,934
12	r/AskScienceDiscussion	+26,404	+16%	193,641	1,689
13	N r/Nootropics	+24,282	+5.7%	453,059	1,857
14	r/skeptic	+21,887	+6.6%	353,600	2,811
15	r/sciences	+21,061	+9.6%	241,108	793
16	r/nuclear	+19,691	+24%	100,693	1,094
17	L r/longevity	+17,058	+8.7%	213,722	263
18	r/signalidentification	+11,604	+48%	35,567	189
19	r/fusion	+10,522	+30%	45,519	347
20	r/cellular_automata	+9,508	+38%	34,780	143
21	A r/Acoustics	+7,943	+35%	30,798	577
22	r/illustrativeDNA	+7,761	+31%	32,491	1,096
23	r/scihub	+7,442	+15%	57,571	78
24	I r/Immunology	+6,128	+31%	26,163	165
25	B r/BlackPillScience	+5,330	+19%	33,281	97

Most active Science News & Discussion subreddits

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

Most active Science News & Discussion subreddits

#	Subreddit	Commenters / mo	Posts / mo	Members
1	r/science	28,225	1,018	34.57M
2	r/AncestryDNA	6,776	1,362	176,363
3	r/labrats	6,409	1,245	729,592
4	r/HotScienceNews	5,769	329	80,950
5	r/NooTopics	3,947	623	113,453
6	r/EverythingScience	3,901	345	667,200
7	r/sciencememes	3,525	311	3.89M
8	r/STEW_ScTecEngWorld	3,465	344	123,960
9	r/skeptic	2,811	216	353,600
10	r/timetravel	2,544	274	167,462
11	r/immortalists	2,201	335	138,751
12	r/ContagionCuriosity	1,934	158	46,474
13	N r/Nootropics	1,857	305	453,059
14	r/AskScienceDiscussion	1,689	206	193,641
15	r/illustrativeDNA	1,096	476	32,491
16	r/nuclear	1,094	220	100,693
17	r/FermiParadox	922	116	10,182
18	r/sciences	793	137	241,108
19	r/science2	694	150	16,835
20	r/SGU	627	65	14,925
21	r/Time	585	131	27,567
22	A r/Acoustics	577	191	30,798
23	r/chemtrails	552	60	21,904
24	N r/neurobiology	502	109	31,411
25	F r/FoodTech	399	62	5,219

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• All topics

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).