The Campeonato Brasileiro Série C 1990, known as the Terceira Divisão,^[1] was a football series played from 29 September to 9 December 2020. It was the third level of the Brazilian National League. The competition had 30 clubs, and four of them were originally promoted to Série B.

In 1991, the Brazilian Football Confederation declared that the 1990 Série C was a deficitary tournament, deciding to extinguish it and allowing 64 teams in the 1991 Campeonato Brasileiro Série B.^[1]

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		PAY	FOR	MAR	TIR	NAC
1	Paysandu	4	3	1	0	5	1	+4	7	Advance to Second phase				1–0		2–0
2	Fortaleza	4	2	2	0	5	2	+3	6			0–0			2–0
3	Maranhão	4	1	2	1	5	3	+2	4				1–1		1–1
4	Tiradentes	4	1	1	2	4	6	−2	3			1–2				2–1
5	Nacional	4	0	0	4	2	9	−7	0				1–2	0–3

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		ARN	EST	CSA	APE	CAM
1	América-RN	4	3	1	0	7	3	+4	7	Advance to Second phase			1–0		1–0
2	Estudantes	4	2	1	1	4	3	+1	5					1–2		2–1
3	CSA	4	1	2	1	4	4	0	4			2–2	1–2
4	América-PE	4	0	2	2	0	2	−2	2					0–0		0–0
5	Campinense	4	0	2	2	2	5	−3	2			1–3		0–1

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		AMG	COL	ARJ	FLU	LAG
1	América-MG	4	2	2	0	3	0	+3	6	Advance to Second phase				2–0	1–0
2	Colatina	4	1	3	0	4	2	+2	5			0–0		3–1
3	America-RJ	4	2	0	2	4	5	−1	4						1–0	2–0
4	Fluminense de Feira	4	1	1	2	3	4	−1	3				1–1			2–1
5	Lagarto	4	0	2	2	1	4	−3	2			0–0	0–0

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		ATL	GAM	VIL	UNI	UBI
1	Atlético Goianiense	4	4	0	0	12	3	+9	8	Advance to Second phase			1–0			5–1
2	Gama	4	3	0	1	3	1	+2	6					1–0	1–0
3	Vila Nova	4	2	0	2	6	6	0	4			1–4				3–1
4	União Rondonópolis	4	1	0	3	2	5	−3	2			1–2		0–2
5	Ubiratan	4	0	0	4	2	10	−8	0				0–1		0–1

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		BAN	NOR	ESP	MOG	CGD
1	Bangu	4	1	3	0	3	0	+3	5	Advance to Second phase			3–0		0–0
2	Noroeste	4	2	1	1	6	5	+1	5						1–0	3–0
3	Esportivo	4	1	2	1	5	5	0	4			0–0	2–2
4	Mogi Mirim	4	1	1	2	2	3	−1	3					1–2		1–0
5	Campo Grande	4	1	1	2	2	5	−3	3			0–0		2–1

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		PAR	CAX	PON	BAN	AME
1	Paraná	4	3	1	0	8	1	+7	7	Advance to Second phase			4–1			2–0
2	Caxias	4	2	0	2	5	7	−2	4					2–1	2–1
3	Ponte Preta	4	1	2	1	3	3	0	4			0–0			1–1
4	União Bandeirante	4	1	1	2	3	5	−2	3			0–2				1–0
5	América	4	1	0	3	1	4	−3	2				1–0	0–1

Matches played on 4 and 11 November.

Team 1	Agg.Tooltip Aggregate score	Team 2	1st leg	2nd leg
América Mineiro	4–2	Paysandu	4–0	0–2
Fortaleza	1–1	América de Natal	0–0	1–1
Gama	1–4	Atlético Goianiense	1–0	0–4
Bangu	1–1	Paraná	1–1	0–0

Bangu and América de Natal qualified due to best record.

Team 1	Agg.Tooltip Aggregate score	Team 2	1st leg	2nd leg
América Mineiro	2–1	Paraná	1–0	1–1
América de Natal	2–7	Atlético Goianiense	0–2	2–5

Atlético Goianiense declared as the Campeonato Brasileiro Série C champions after a 3–2 penalty win (0–0 aggregate score).^[1]