Thatiana Regina Ignácio (born 2 July 1983) is a retired Brazilian athlete who specialised in the sprinting events.^[1] She competed with her teammates in the 4 × 100 metres relay at the 2005 and 2007 World Championships finishing fifth on the first occasion. She won multiple medals at the regional level.

She has personal bests of 11.45 seconds in the 100 metres (2007) and 23.92 seconds in the 200 metres (2005).

Year	Competition	Venue	Position	Event	Notes
Representing  Brazil
1998	World Youth Games	Moscow, Russia	2nd	100 m	12.05
			7th	4x100 m relay	49.33
	South American Youth Championships	Manaus, Brazil	1st	100 m	12.04
			2nd	200 m relay	25.00
			1st	4x100 m relay	47.89
1999	World Youth Championships	Bydgoszcz, Poland	10th (sf)	100 m	11.94
			52nd (h)	200 m	26.44
			5th	Medley relay	2:12.13
	South American Junior Championships	Concepción, Chile	2nd	100 m	11.73
			2nd	4x100 m relay	46.63
2000	South American Junior Championships	São Leopoldo, Brazil	1st	100 m	11.89
			3rd	4x100 m relay	47.39
	World Junior Championships	Santiago, Chile	8th	100 m	11.84 (wind: +2.0 m/s)
	South American Youth Championships	Bogotá, Colombia	1st	100 m	11.55 (A)
			2nd	4x100 m relay	46.15 (A)
			1st	4x400 m relay	2:12.21 (A)
2001	South American Championships	Manaus, Brazil	1st	4x100 m relay	44.32
	South American Junior Championships	Santa Fe, Argentina	1st	100 m	11.64
			1st	4x100 m relay	45.09
	Pan American Junior Championships	Santa Fe, Argentina	1st	100 m	11.54
			1st	4x100 m relay	45.36
2002	Ibero-American Championships	Guatemala City, Guatemala	2nd	100 m	11.49
			1st	4x100 m relay	44.28
	World Junior Championships	Kingston, Jamaica	5th	100 m	11.79 (wind: -0.2 m/s)
	South American Junior Championships / South American Games	Belém, Brazil	1st	100 m	11.57 (wind: +1.3 m/s)
			1st	4x100 m relay	45.30
2003	South American Championships	Barquisimeto, Venezuela	1st	4x100 m relay	44.16
	Universiade	Daegu, South Korea	3rd	4x100 m relay	45.79
2004	South American U23 Championships	Barquisimeto, Venezuela	1st	100 m	11.63 (wind: +0.0 m/s)
			1st	4x100 m relay	45.36
2005	South American Championships	Cali, Colombia	2nd	4x100 m relay	44.35
	World Championships	Helsinki, Finland	5th	4x100 m relay	42.99
2007	South American Championships	São Paulo, Brazil	1st	4x100 m relay	43.54
	Pan American Games	Rio de Janeiro, Brazil	6th	4x100 m relay	44.14
	World Championships	Osaka, Japan	15th (h)	4x100 m relay	44.64