June 21, 2018

TOUCHSTONE STRATEGIC TRUST

Touchstone Credit Opportunities Fund

Touchstone International Growth Opportunities Fund

Touchstone International Small Cap Fund

Touchstone Large Cap Fund

Touchstone Large Company Growth Fund

Touchstone Ohio Tax-Free Bond Fund

Touchstone Small Cap Value Opportunities Fund

Touchstone Value Fund

Supplement to Prospectus and Statement of Additional Information dated October 30, 2017

The information in this Supplement contains new and additional information beyond that in the Prospectus and Statement of Additional Information and should be read in conjunction with the aforementioned.

Effective July 1, 2018, the following statement in the “Waiver of Class A Sales Charge,” “Reduced Class A Sales Charge,” “Rights of Accumulation Program,” “Letter of Intent,” “Class C Shares,” “Contingent Deferred Sales Charge (“CDSC”)," "Additional Information on the CDSC" and "Waiver of Class A Sales Charge for Clients of Financial Intermediaries" disclosure in the Prospectus and Statement of Additional Information (as applicable) will be revised to include the addition of Morgan Stanley:

Please see Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts in the prospectus for a description of variations in sales charges and waivers for Fund shares purchased through Merrill Lynch and Morgan Stanley.  

Effective July 1, 2018, the following is added to Appendix A to the Funds' Prospectus:

Shareholders Purchasing Fund Shares Through Morgan Stanley

The following information is provided by Morgan Stanley Smith Barney LLC ("Morgan Stanley"): Effective July 1, 2018, shareholders purchasing Fund shares through a Morgan Stanley Wealth Management transactional brokerage account will be eligible only for the following front-end sales charge waivers with respect to Class A shares, which may differ from and may be more limited than those disclosed elsewhere in the Funds' prospectus or SAI.

Front-end Sales Charge Waivers on Class A Shares available at Morgan Stanley Wealth Management

• Employer-sponsored retirement plans (e.g., 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans). For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs, SAR-SEPs or Keogh plans

• Morgan Stanley employee and employee-related accounts according to Morgan Stanley’s account linking rules

• Shares purchased through reinvestment of dividends and capital gains distributions when purchasing shares of the same fund

• Shares purchased through a Morgan Stanley self-directed brokerage account

• Class C (i.e., level-load) shares that are no longer subject to a contingent deferred sales charge and are converted to Class A shares of the same fund pursuant to Morgan Stanley Wealth Management’s share class conversion program

• Shares purchased from the proceeds of redemptions within the same fund family, provided (i) the repurchase occurs within 90 days following the redemption, (ii) the redemption and purchase occur in the same account, and (iii) redeemed shares were subject to a front-end or deferred sales charge.

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Please contact your financial advisor or Touchstone at 800.543.0407 if you have any questions.

P.O. Box 9878 · Providence, RI 02940-8078

Ph: 800.543.0407 · TouchstoneInvestments.com

Touchstone Funds are distributed by Touchstone Securities, Inc.*

*A registered broker-dealer and member FINRA and SIPC

A Member of Western & Southern Financial Group

Please retain this Supplement for future reference.

TSF-54BB-TST-S12-1806